第一篇:青岛版数学配套练习册七下答案
青岛版数学练习册七年级下册参考答案
8.1 1.(1)∠A,∠C;(2)∠ABC,∠ABD,∠DBC,∠ADB,∠BDC;(3)3个,∠ABD,∠ABC,∠DBC.2.B.3.(1)∠AEB,∠DAE,∠BEC,∠ADB;(2)∠C,∠D.4.3个角;6个角;10个角.5.9时12分或21时12分.8.2 1.(1)42°;(2)不变.2.C.3.D.5.46°.提示:设∠COE=x°,则x-8=130-2x,x=46.6.(1)45°;(2)不变;提示:90+2x2-x=45;(3)不变.提示:90-2y2+y=45.8.3第1课时
1.(1)42°20′24″;(2)56.35.2.(1)61°38′10″;(2)32.6.3.C.4.C.5.(1)93°12′;(2)47°31′48″;(3)12°9′36″;(4)33°7′12″.6.(1)112°27′;(2)51°55′;(3)125°37′30″.7.0.5°,6°.8.(1)15°;(2)172.5°.9.40分钟.第2课时
1.153°.2.53°17′45″.3.C.4.C.5.63°.6.(1)相等;(2)180°.7.60°.8.4 1.∠3,∠AOD.2.121°.3.C.4.B.5.∠3=25°30′,∠2=45°.6.∠2=63°30′,∠3=53°.7.(1)2对;(2)6对;(3)12对.8.5 1.70°.2.45°.3.D.4.C.5.132°.6.135°.7.60°,30°.第八章综合练习
1.130°.2.36°16′30″.3.50°.4.(1)54°34′,125°26′;(2)α-90°.5.47.6.D.7.A.8.C.9.D.10.138°.11.125°.12.∠AOC+∠BOC=2(∠DOC+∠COE)=2×90°=180°,A,O,B共线.13.设∠BOE=x°,∠EOC=2x°,∠AOB=180-3x,∠DOB=72-x.得方程(72-x)×2=180-3x,解得x=36.即∠EOC=72°.14.∠BOC+∠COD+∠AOD=270°,∠EOF=170°,∠AOE+∠BOF=190°-90°=100°.∠COF+∠DOE=100°.又∠EOF=170°,∠COD=170°-100°=70°.检测站
1.45°.2.98.505°.3.∠AOB,∠BOC.∠AOB,∠BOD.4.C.5.D.6.∠BOD,∠FOE,∠BOC;∠BOF.7.45°.8.97.5°.9.1 1.∠END.2.DE,AB,BC;AB,BC,DE.3.B.4.C.5.∠CAD,∠BAC,∠B.6.同位角:∠EAD与∠B;∠EAC与∠B;内错角:∠DAC与∠C;∠EAC与∠C.同旁内角:∠DAB与∠B;∠BAC与∠B.7.略.9.2 1.相交,平行.2.不相交.3.一.4.C.5.略.6.略.7.正方形.8.略.9.3 1.65°,两直线平行,同位角相等,65°,对顶角相等.2.65°.3.B.4.C.5.130°.6.∠B,∠EFC,∠ADE.7.40°.9.4第1课时
1.AC,BD,内错角相等,两直线平行.2.(1)EN,BD;(2)AB,CD.3.B.4.∠5=∠2=105°,∠5+∠1=180°.5.DE∥MN.由AB∥MN,DE∥AB.6.提示:由AD∥BC,得∠A+∠B=180°,∠C+∠B=180°,AB∥CD.7.(1)由∠3=∠B,知FD∥AB,知∠4=∠A;(2)由ED∥AC,知∠1=∠C,∠BED=∠A.第2课时
1.4厘米.2.BD,BE.3.D.4.由∠B=∠C,知AB∥CD,故∠A=∠D.5.∠1=∠GMC=90°-∠2.6.(1)∠MDF=∠MBE,BE∥DF;(2)不是;它是AB和CD之间的距离.7.在∠B内画射线BF∥AE,则BF∥CD.∠ABF=120°,∠FBC=30°,∠C=180°-30°=150°.第九章综合练习
1.110°.2.AD∥BE,BD∥CE,AD∥BE.3.35°.提示:过点M画MN⊥AB,MN∥EG,∠HMN=∠E,∠HMN=90°-∠AMH.4.C.5.C.6.D.7.126°.8.∠1=115°.9.25°.10.∠3=80°,∠4=100°.11.因为AB∥CD,所以∠AEF=∠2,∠AEG=∠3,因为∠AEG=∠1+∠2,所以∠3=∠1+∠2.12.22°.提示:过点A画直线c∥a.检测站 1.内错,同旁内,同位.2.180°.3.A.4.B.5.AB∥CD,AD∥BC.6.AD∥BC.DB平分∠ADC代替第二个条件.10.1 2.5.3.C4.D.6.a=7,b=-9.7.设需要汽车x辆,共有y人外出参观,35x+15=y, 45(x-1)=y.解得x=6, y=225..8.不是.10.2第1课时
1.-35x+85,-53y+83.2.x-1=0.3.B.4.(1)x=-12,y=52;(2)s=-3,t=-3;(3)m=2,n=1.5.x=1,y=-1.6.提示:按丙的方法,35x=3,25y=4,得x=5,y=10.第2课时
1.2.2.-11.3.C.4.B.5.(1)x=-1,y=-8;(2)x=5,y=272.6.x+y=a,x-y=b,解得a=2,b=-1,又解得x=12,y=32.7.k=4.10.3第1课时 1.4x+y=6,-5x+4y=-7.2.C.3.(1)x=1,y=1,z=1;(2)x=1,y=2,z=3.4.解三元一次方程组,用a表示解,得x=a,y=a+1,z=a-1,代入方程-x+2y+3z=6,得a=74.5.将z看做已知数,将x,y解出来.得x=1911-z,y=211-z.x+y+2z=1911-z+211-z+2z=2111.第2课时
令1.加减,①,②.2.B.3.(1)x=2,y=1,z=-1;(2)x=1,y=2,z=2.4.a=1,b=-1,c=1.10.4第1课时 1.7x+3=y, 8x-5=y.2.320,180.3.C.4.216,1095.90元,100元.6.5元,3元.7.提示:设小长方形宽x,长y,则5x=3y,y+2x=2y+2,得x=6,y=10.第2课时 1.112x=0.5+112y, 0.5x=(0.5+1)y.2.30,18.3.D.4.C.5.21张铁皮做盒身,28张铁皮做盒盖.6.长木6.5尺,绳长11尺.7.(1)x+y=90,46%x+70%y=90×64%,x=22.5,y=67.5.(2)46%x+70%y=64%(x+y),x∶y=1∶3.*第3课时 1.x+y+z=21, x+y-z=5, x-(z-y)=5.2.4,8,10.3.C.4.2,3,5.5.12,8,7.第十章综合练习
1.43.2.-1.3.-112,5,(113,0).4.-14.5.x=1,y=2.6.y=23x-53.7.B.8.A.*9.D.10.(1)x=1,z=2;(2)x=6,y=24;(3)x=3,y=2;*(4)x=2,y=-3,z=-1.11.300棵,200棵.12.50人,220件.13.23.14.中型15辆,小型35辆.15.m=-275.16.30千米,70千米,42千米.17.平均每天1只大牛需用饲料20千克,小牛需用5千克.所以王大伯对大牛食量的估计是正确的,对小牛食量的估计偏高.18.火车速度22米/秒,列车长276米.19.(1)x=2,y=2,也是剩下一个方程的解.(2)不唯一.如x-y=0.检测站
1.-10.2.a=2,b=1.3.5千克,2千克.4.C.5.C.6.a=5.*7.x=1,y=2,z=3.8.牛值金2两,羊值金1两.9.男生270名,女生260名.11.1 1.108.2.x12.3.x4.4.D.5.A.6.1.5×108.7.(1)m9;(2)3×1011.8.(1)(a-b)5;(2)-(2x-3y)3n+1.9.0.10.0.11.2第1课时
1.-8t3.2.116a4b4.3.-6x2.4.A.5.C.6.(1)28x3y3;(2)anbn;(3)-9a3x3.7.a2b.8.1.9.1102n.10.14位数.第2课时
1.(1)x10;(2)-8x12.2.C.3.D.5.(1)19x2y4;(2)215;(3)x12;(4)64m12n6.6.(1)x6n+2;(2)-(a+b)7;(3)35n-2.7.提示:24<33,(24)25<(33)25.11.3第1课时
1.12xy3.2.-6x2y3.3.B.4.D.5.(1)m5n2;(2)1.2×1020.6.(1)-14x5y4z2;(2)64x6.7.-730(a-b)8n-4.8.C.第2课时
1.3x2-5x3.2.x2-y2.3.D.4.C.5.(1)-3x2y+2xy2-52xy;(2)x4+4x2+2x-4;(3)12b3-b2+6b.6.2m3n3-8m2n3.7.x=-12.8.10.11.4第1课时
1.x2-7x+10.2.-6x2-xy+2y2.3.B.4.B.5.(1)-6m2+19m-15;(2)-12x3+14x2-4x;(3)-3y2-23y+108.6.4x2-100x+600.7.-x2-29x+32,1854.8.提示:该代数式的值恒为22.9.x=-110.b=12.第2课时
1.x3+2x2-5x-6.2.2a3+5a2+a-3.3.B.4.C.5.(1)m3+2m2-1;(2)2a3-5a2b+8ab2-3b3;(3)-2x3-x2-7x+10.6.x3+x-5,值为-7.7.x=-12.8.0.11.5 1.4.2.m8.3.xn.4.D.5.B.6.16.7.(1)-a;(2)a3.8.(1)y-x;(2)(x+2y)6.9.2xy.11.6第1课时
1.1.2.1.3.0.4.C.5.D.6.(1)64;(2)a.7.(1)3 129;(2)200.8.7.9.a≠0,m=n.第2课时
1.181.2.-164.3.100.4.B.5.C.6.(1)200;(2)10 099;(3)100.7.10-1,10-2,10-3,10-4.8.a<b<d<c.9.x≠-13.10.1.第3课时
1.1.2.1a4.3.a8.4.C.5.125.6.(1)10;(2)x5;(3)11 000 000;(4)1a7.7.13a.8.2-101.第4课时
1.1.2×10-4.2.0.000 002 76.3.2.5×10-9.4.D.5.D.6.(1)1.5×10-2;(2)2.1×103;(3)1.5×10-3.7.x=-7.8.1.572×104.9.花粉直径较大,是兔毛直径的7.2倍.第十一章综合练习
1.106.2.x9.3.a.4.tn.5.(a+b)2.6.x5.7.a7.8.15x3y3z.9.2a3+2a2b+2ab.10.-2x2+3x-1.11.B.12.B.13.B.14.A.15.(1)x9;(2)-(a+b)4;(3)-a2b2+6ab+23a;(4)-6n+2;(5)2a3+8ab2-14a2b;(6)-3x2-23x+108;(7)6x2-13xy;(8)-x13y12.16.(1)-x,1;(2)5x-1,101.17.x=-1.18.(1)x=4;(2)n=2,m=4;(3)M=x2-6x+9.19.2ab+2b2.20.n(n+5)-(n-3)(n+2)=6(n+1).检测站
1.(x+y)5.2.-6a3b3c.3.-2x3-4x2+2x.4.a6b6.5.C.6.B.7.B.8.1.24×10-6.9.299.10.(1)36x2-114x+90;(2)91x2-277x+210.11.长
8、宽5.12.1 1.b2-9a2.2.x4-4.3.1681m2n2-49.4.5x+3y.5.C.6.B.7.(1)c2-9a2b2;(2)9y2-4x4;(3)a4-b4;(4)-5x2-9.8.(1)(300+3)(300-3)=90 000-9=89 991;(2)1.9.(2n-1)(2n+1)=(2n)2-1.10.原式×3-23-2=332-232.12.2第1课时
1.-2ab.2.a2+4ab+4b2.3.k=8.4.B.5.C.6.A.7.(1)9m2-32n+116;(2)x4-2x2+1;(3)a2+2ab+b2;(4)916s2+st+49t2.8.(a+b)2=4ab+(a-b)2.9.a2+2ab+b2=9,a2-2ab+b2=49.ab=14(9-49)=-10.a2+b2=9-2ab=29.第2课时
1.4ab.2.a2+b2+c2+2ab-2ac-2bc.3.x2-y2+z2+2xz.4.B.5.B.6.A.7.(1)2a2b2-b4;(2)2y2+2x+5;(3)(100-3)(100-1)(100+1)(100+3)=(104-9)(104-1)=108-105+9=99 900 009.8.12.9.48π(a+1).10.8.12.3 1.2x2y.2.2a4-ab+6.3.a-b-2.4.D.5.C.6.(1)xy(x-y);(2)4ab(bc+4);(3)-2xy(1+2x-4x2);(4)-(3a+b)(a+3b);(5)2x(x-y)2(1-2x).7.1 999.8.14ax(2a-x)2.9.能.256-510=512-510=510(25-1)=24×510.12.4第1课时 1.(x+2y)(x-2y).2.k=-140.3.D.4.C.5.(1)(6+x)(6-x);(2)(12y+1)2;(3)-(m-n)2;(4)(3+14a)(3-14a).6.(1)8 056;(2)90 000.7.(1)(1+a+b)(1-a-b);(2)(a-b+2)2.8.左
端
=[(a-b)2+(a+b)2+(a-b)2-(a+b)2][(a-b)2+(a+b)2-(a-b)2+(a+b)2]·=4(a-b)2(a+b)2.第2课时
1.提出公因式,用公式法进行因式分解.2.x(x+1)(x-1).3.(a-1)(x+y)(x-y).4.D.5.C.6.(1)m(m2+1)(m+1)(m-1).(2)2x3(3y+1)(3y-1).(3)(x+2)2(x-2)2.(4)(x+1)4.7.原式=12·32·23·43·34·54„910·1110=1120.8.2 0122(2 0112-1)+(2 0132-1)=2 0122(2 011+1)(2 011-1)+(2 013+1)(2 013-1)=2 01224 024=1 006.第十二章综合练习
1.9x2-y2.2.25-4b2.3.25a2-20ab+4b2.4.14m4+2m2n+4n2.5.-2m.6.x-y+2.7.(xy+2z)(xy-2z).8.23m-0.1n.9.C.10.C.11.C.12.(1)4x2+4xy+y2-25z2;(2)-280y2+1 295;(3)116x4-181y4.13.(1)2a3x2(2+a)(2-a);(2)(x-y)(a+2y)(a-2y);(3)-(a-b)2(a+b)2;(4)(x2+2x+7)(x-1)2.14.(1)31×(573+427)×(573-427)=4 526 000;(2)76 900;(3)10099.15.πR2-4πr2=π(R+2r)(R-2r)=3.1
4×
×
5.6=175.8
厘米.16.(n+7)2-(n-5)2=(n+7+n-5)(n+7-n+5)=24(n+1).17.x=141.18.x=2,y=-3,16.19.(2n+1)2-(2n-1)2=(2n+1+2n-1)(2n+1-2n+1)=8n.检测站 1.2b-3a.2.20
或-20.3.5-a2.4.B.5.B.6.(1)x8-y8;(2)-16x2.7.(1)x2y4(xy2+z)(xy2-z);(2)(m-n+4mn)(m-n-4mn);(3)12x(2a-1)2.8.原式=(x+1)(2x-3)x.当x=12时,原式=-32.9.324-1=(312+1)(36+1)(33+1)(33-1)=28×(312+1)(36+1)(33-1).10.原式=12(a-b)2=2.13.1第1课时
1.(1)√;(2);(3)√;(4)√;(5).2.△ABC,△BDC,△BEC;△ABE,△DBE.3.14或16.5.(1)∠A,∠ACD,∠ADC;∠A,∠ACB,∠B;(2)△DAE,△DAC,△BAC;△ADC,△BDC;(3)△BDC;△ACD,△EDC.不是.6.当四点中任意三点不共线时,组成4个三角形;当四点中有三点共线时,组成3个三角形;若该四点共线时,不能组成三角形.第2课时
1.3.2.105厘米或200厘米.3.B.4.B.5.9种:4,5,6,7,8,9,10,11,12(单位:厘米).6.4厘米,6厘米.7.8或10.8.8种:1,4,4;2,3,4;2,4,4;2,4,5;3,4,3;3,4,4;3,4,5;3,4,6.第3课时 1.ACE,BCD.2.(1)AE,4厘米;(2)DAC,12;(3)AF.3.C.4.C.5.△ABC,△ABD,△ADC,△ABE,△AEC,△ADE.6.相等.∠1=∠DAC=∠DAE=∠2.∠EAF=∠EDF.7.(1)△BCD,△OCD;(2)△ABC,△ABO和△BOC有一条高重合;△BCD,△OCD和△BOC有一条高重合.第4课时
1.70°.2.45°.提示:∠APD=∠A2+∠C2.3.C.4.C.5.(1)125°;(2)35°.6.70°.7.50°.8.(1)105°;
(2)115°;(3)90°+12n°.提示:延长BO交AC于D,∠BOC=∠BDC+12∠C=∠A+12∠B+12∠C=90°+12∠A.13.2第1课时
1.n-3,n-2.2.5.3.B.4.D.5.五角星.6.8个;△ABC,△ABD,△BCD,△ACD,△OAB,△OAC,△OBD,△OCD.7.6.8.60厘米.第2课时
1.1 440°,360°,144°.2.8.3.12,150°.4.C.5.D.7.36°.8.18,130°.13.3第1课时
1.√;;√;√;√;.2.O,2厘米.3.圆外,圆内,6.4.弦:AB,BC,CD,AD,BD,AC;半圆:ABC,ADC;优弧:BAD,CAD,BAC,ABD,ACB;劣弧:AB,BC,CD,AD,BCD.6.列方程:2π(80+10)8=2π(80+10+x)10,x=22.5(厘米).第2课时 1.;.2.a2(1-π4).3.3.4.一样远.5.6π.第十三章综合练习
1.30°,60°.2.95°.3.钝角.4.∠A=40°,∠C=140°.5.20°.6.M在圆内部.7.B.8.D.9.B.10.D.11.36°,72°,72°.12.(1)y=90-x2;(2)y=45;(3)60.13.8,8,11或10,10,7.14.(1)将平面分为5部分:小圆内、小圆上、圆环内、大圆上、大圆外.(2)条件分别是:OP<5,OP=5,5<OP<8,OP=8,OP>8.15.延长AP到BC上点D,利用三角形外角性质,可推出∠APB>∠C.16.3圈.检测站
1.5,4.2.10个.3.2,1.4.六.5.B.6.C.7.3个.8.∠ADB=80°,∠DAE=10°.9.(1)∠AEF>∠D>∠A(由外角定理);(2)∠AFD=∠ACD+∠D=∠A+∠B+∠D.综合与实践第1课时
1.条件是:多边形每条边都是该多边形与相邻多边形的公共边,每个顶点处各内角之和是360°.2.正六边形.3.B.4.D.6.6,3,3.第2课时
1.正三角形2.正方形.3.C.4.D.5.(1)3,2.6.3n,2n+1.14.1 1.2,5.2.C.3.储蓄所,诊所(6,9),商店(7,3),学校(1,1).4.5排3列.5.23.6.(1)(C,4),(A,4),(0,3),(0,1),(A,0),(C,0),(D,1),(D,3);(2)(E,3)→(G,4)→(H,2)→(F,3)→(G,1)(答案不唯一).14.2 1.四,5,2.2.x轴或y轴上.3.C.4.D.5.在第二、四象限的角平分线上,如(1,-1).6.(2,0),(7,0);(0,2),(0,4).7.第二象限,(2,0),(-2,1);第一象限,(2,2),(0,3).14.3第1课时
1.B(3,3),D(-2,-2).2.C.3.小房子.4.42.5.(32,3),(64,0).第2课时
1.(-2,-3),(3,-4),x′=x-2, y
′=y-3.2.A.3.A(0,0),B(5,1),C(0,-3),D(-2,-2).4.(1)(0,0),(0,1.5),(3.8,0),(3.8,1.5),(1.7,0.5);(2)(-3.8,-1.5),(-3.8,0),(0,-1.5),(0,0),(-2.1,-1).5.以(1,1)为原点O′,x′轴∥x轴,y′轴∥y轴,分别以向右、向上为正向,单位长度不变,建立直角坐标系.A,B,C坐标分别是A(-2,1),B(2,-2),C(-1,2).14.4 1.北偏西45°,1.5.2.A.3.略.4.略.第十四章综合练习
1.(9,8).2.一.3.2.4.6.5.D.6.B.7.略.8.二,四,三,一,x轴,y轴.9.(2,6)或(2,-6).10.x轴上,(0,5),(5,0).检测站 1.(-2,-2).2.(1)3;(2)-2;(3)四.3.B.5.“国”字.6.P,Q,R分别在长方形内部、边界上、外部.总复习题
1.45°.2.∠DCE=∠A.3.12.4.-2 012.5.125°.6.D.7.D.8.A.9.C.10.75°.11.第二象限.12.24.5吨.13.(1)22x-23,21;(2)-2y2+19y,9.14.12.15.y=-12x.16.购一等门票3张、三等门票33张,或购二等门票7张、三等门票29张.提示:分三种情况分别列二元一次方程组,其中购一等门票、二等门票不可行.17.玩具走的是正12边形,共走了12米.总检测站
1.44°.2.(1)AB∥DF;(2)ED∥AC;(3)ED∥AC.3.x=2,y=-5.4.a=-73,b=53.5.-y2-7x.6.-7.7.18°.8.C.9.C.10.A.11.B.12.(1)∠DOC=∠B=∠E;(2)不一定;还可能互补.13.4.14.3516x3-418x2-32x-12.15.(a+1)2(a-1)2.*16.7,5,6.17.12边形.18.分两种情况讨论:D点在B,C之间和D点在B,C之外.分别由面积求出高,建立直角坐标系,以垂足为原点,以直线BC为x轴,以高所在直线为y轴.
第二篇:七下英语配套练习册答案
I.问句应答。(听五个问句,选出最佳的应答句。每个句子读两遍。共5分 6.A.Comedies.I think they’re funny.B.Let’s go to a movie tonight C.This play is very interesting.7.A.I like both of them B.Shanghai is a big city C.I live in Beijing 8.A.Yes, I want to join the music clu b B.The sports club doesn’t need new balls.C Yes, and I’m in the running club.9.A.My favorite subject is history B.Our history teacher is very strict C.I don’t like history at all.10.A.I want to buy a strawberry cake.B.Sure, I’m good at making cakes.C.This birthday cake looks good.III.对话理解,(听五组小对话,根据你所听到的对话内容选择能回答 下列问题的最佳答案。每组对话读两遍。共5分。)11.Who likes Jet Li best?
A.The girl.B.The boy’s mother.C.The boy.12.Why does the boy need some new shirts?
A.He needs a new shirt for a party.B.He doesn’t like his old shirts any more.C.His old shirts are too small for him.13.What does Henry usually eat for lunch? A.Hamburgers and French fries.B.French fries and fruit.C.Fruit and vegetables.14.How many hours does the woman work a day? A.Eight hours.B.Nine hours.C.Thirteen hours.15.What does the girl usually do in the morning?
A.She plays basketball.B.She goes running.C.She cooks breakfast.IV.短文理解(听短文,根据你所听到的内容补全下面的卡片,每空一词,短文读两遍。FOOTBALL GAME
(16)_____________ VS America
共5分)DATE: November 29th PLACE: The(17)TIME:(18)_______ ____ BUS: No.17 TICKECOST:(19)
I.选择最佳答案。(20分)(TEL(20)
Stadium(体育场))1.There is _____ “u” in the word “computer”.A.a B.an
C.the C.going
D./ D.to go
D.aunt D.helping()2.Kate with her parents often __________ to a movie on weekends.A.go B.goes A.uncle A.help()3.John is my son, but I’m not his father.I’m his ______.B.mother B.helps
C.brother C.to help()4.Thanks for ________ me.()5.The pants ____ nice, I’ll take______.A.look;them B.looks;it C.look;it A.twelve;twelve B.twelfth;twelfth C.twelfth;twelve D.twelve;twelfth()7._____ your father like bananas? A.Has B.Is C.Does
D.Do
()8.These green shorts are ____sale ____ $10.A.on;at B.on;for
C.for;of D.in;at
C.Saturday D.Friday()9.______ is the first day of a w eek.A.Monday B.Sunday()10.______ your father _____ with you?
A.Does;strict B.Do;strict C.Is;strict D.Are;strict
()11.— Let’s play ping-pong.—_______.A.Yes, please B.Thank you C.No, I don’t D.That sounds good()12.-________he paint ?-No, he can't A.Does A.a B.Is C.Do B.an C.the
D.can D./()13.Bob is ____ eleven-year-old boy.()14.-----How much are the shoes?------________ 100 dollars.A.It’s B.These are C.They are D.This is
D.looks;them
()6.My son is ____.Today is his _____birthday.()15.The books are very _______.They sell very ______.A.good;good B.well;well C.well;good D.good;well()16.Can I join the ______ club? A.swims B.swimming C.swim
D.swiming
()17.He _______ breakfast at home.A.hasn’t B.haven’t
C.doesn’t have D.don’t have
()18.----Jane, your dress is beautiful(美丽的).------________.A.No, it isn’t.B.Really? C.Thank you.D.Yes, it is.A.at B.on C.around A./;a B.a;/ C.the;The
D.to D.a;The()19.-----What time is it?-------I think it’s ______ 6:00.()20.I have _____ soccer ball._______ soccer ball is on the floor.II.完型填空(10分)Jim 1 from America.Now he is 2 China.He 3 at about 6:30 and eats his breakfast at 7:0 0 in the morning.After breakfast, he says “goodbye” 4 his parents and leaves(离开)home at 7:30.He usually walks to school.He gets there at 7:55.He 5 his first class at eight.Morning classes are over at 12:10, and he eats lunch ten minutes later at about 12:20.After lunch he plays 6 his friends.Afternoon classes begin at 1:30.Usually there are two classes in the 7.School is over at 3:30.Usually he plays games or do 8 things and gets home at about 5:15.He eats supper at 6:00 and then 9 , then he watches TV.He www.xiexiebang.come B.is)2.A.in)4.A.with B.at B.for
C.are C.on C.and C.start C.to D.or
C.evening D.night
D.others
D.does his homework
C.takes
D.be D.of D.to D.begin)3.A.plays B.gets up C.goes home D.goes to school)5.A.have B.has)6.A.with B.and)7.A.afternoon B.morning)9.A.swim B.goes to bed)8.A.another B.an other C.other)10.A.goes to school B.goes to bed C.goes home D.goes to the room
III.阅读理解(共40分,其中A----D篇每小题1分,E---F篇每小题2分。)阅读下列短文,选择最佳答案。
A
One day,a little boy came to a shop and said to the shop assistant(店员): “I want to buy twelve exercise-books of 10 cents(美分)(1 00美分=1美元)and nine pencils of 15 cents, four erasers of 20 cents.How much shall I pay(付款)?”
“If I give you 5 dollars, how much shall I get back?”
“You'll get back 1.65 dollars.Shall I pack(打包)these things for you?”
“No, I don't buy anything” the boy looked at the piece of paper and said politely(礼貌地).“This is my math homework.Can I take the answer away?” 阅读短文,选择正确答案。(5分)
()1._______ kinds of things are mentioned by(被提到)the boy.A.One B.Two
C.Three D.Four
B.to buy something for his home()2.The boy went to the shop _______.A.to buy something for his school()3.Nine pencils of 15 cents is ______.A.$ 1.35 B.$ 1.65
C.$ 0.15 D.2.15
()4.The shop assistant asked(要求)the boy to pay _________ after she answered boy.A.no thing B.$ 3.35
C.$ 1.65 D.$ 5 C.to see how many things the shop has D.to get an answer
()5.The boy bought(买)________ at last(最后).A.nothing B.nine pencils C.twelve exercise-books D.four erasers B
Dear Mr.Wang, Someone comes to the office to see you in the morning, but you and your wife are out.He comes here at 10am.Because he is very busy, he goes away half an hour later.He tells me that he is your classmate at college(大学).Now he teaches Chinese in a high school(高中)in this city and he lives near the No.6 Middle School.He is a very tall man with short hair.He wears a pair of glasses.He tells me his telephone number is 33426685.He is often at home at 7:00 pm.So you can call him in the evening.()1.The author(作者)writes this note(便条)to ______.A.Mr.Wang B.Mr.Wang’s wife C.Mr.Wang’s classmate D.me()2.Mr.Wang’s cl assmate is __________.A.a teacher B.a worker C.a farmer D.an actor()3.When is Mr.Wang’s classmate often at home? A.In the morning B.In the afternoon.C.At 7:00 pm.D.We don’t know.()4.How long does Mr.Wang’s classmate stay in the office? A.Ten hours.B.An hour.C.Two hours.D.Half an hour.()5.Which of the following is TRUE? A.Mr.Wang and his wife are classmates.B.Mr.Wang’s classmate is short.C.Mr.Wang goes out with Mrs.Wang in the morning.D.Mr.Wang’s classmate meets Mr.Wang in the morning C
Joan is an American girl.She lives in China now.She is in my class.Her parents work in us English well.We all like his class.On Sundays, Joan goes to the People's Park with her father and mother.Sometimes she goes shopping with her mot her.They like the Chinese food very much.It's a happy family.()1.Joan is from ________.A.China B.Japan
C.the U.S.A.D.Canada
C.Five.D.Six.()2.How many people are there in Joan’s family?
A.Three.B.Four.()3.Joan's ________ is an English teacher.A.father A.Often.B.mother C.brother B.Never.D.father and mother
()4.How often does Joan go to the shop?
C.Every Sunday.D.Sometimes.()5.What can we know from the passage(段落)? A.Joan's mother is a good doctor.B.There are three people in her family.C.They like to eat the Chinese food a lot.D.The family are all in China.D
根据短文内容,判断正(T)误(F)Old Henry lived on a clean street in Green C ity.Every weekend, Alan and his friends played soccer in the street.The children were too noisy(吵闹的)for the old man to have a good rest.One day, Old Henry told the children that he would give them $ 10 each weekend to watch them play soccer in the street.He said, “I am so glad when seeing you play soccer happily.” Alan and his friends were surprised to hear Old Henry’s words.The first weekend after that, the boys went to play soccer near the old man’s house, and went away happily with 10 dollars.The second weekend they also got 10 dollars.The third weekend, Old Henry said he spent his money on his grandson’s school things.So he only gave the children 4 dollars.The next weekend, Old Henry said he had a cold and he spent his money on medicine(药).He only gave them 1 dollar.After that, Alan and his friends didn’t play soccer in that street any more.()1.Alan likes playing soccer.()2.Alan and his friends cleaned the street every weekend.()3.Old Henry’s grandson is a student.()4.Old Henry gave 26 dollars in all(总共)to the children.()5.In fact, Old Henry didn’t want the children to play soccer near his house.E
It’s April 13th.It’s Mary’s birthday.(A)She and her mother go to a big city by bus.They see many clothes stor es and hotels there.They come to a clothes store first.(B)Mary’s mother buys a red skirt for Mary.Then they go to a food store.(C)There they buy some chicken hamburgers.Then they go to Green Hotel.They go to see Mary’s uncle.(D)他在这个旅馆工作。Green Hotel is a big hotel with 120 rooms.Each room is very nice.Mary has a good time in the hotel.按下列任务要求完成各项。(共10分,每小题2分。)1.写出划线部分(A)处的同义句
She and her mother _____________________________to a big city.2.将划线部分(B)处译为汉语
_________________________________________________ 3.将划线部分(C)处改为否定句
There they __________ buy ___________ chicken hamburgers.4.将划线部分(D)处译为英语
________________________________________________ 5.根据短文内容回答问题
How many ro oms are there in Green Hotel?
________________________________________________ F
I usually wake up(醒来)early in the morning.Then I get up and get dressed(穿衣).I eat my breakfast at seven.I have bread and milk for breakfast.I leave the house at around seven thirty.I don’t like to be late for school.I have many classes in the morning.At around twelve, I come home for lunch.In the afternoon, I’m not so busy.After school, I do my homework and play with other children.At five thirty, my father and mother come back from work.We have supper.After that, we read newspapers(报纸)or listen to the radio for a little while(一会儿).Sometimes we watch TV.I go to bed at nine.But my father often works late at night.He goes to bed at midnight.根据短文内容回答问题(共10分,每题2分)1.What do you have for breakfast?
_____________________________________________ 2.Are you often late for school?
_____________________________________________ 3.What time do you come home for lunch?
_____________________________________________ 4.What do you do after school?
_______________________________________________ 5.What time does your father go to bed?
_______________________________________________ IV.补全对话(15分)
A)从方框中选择合适的句子完成对话。(5分)Tom: Lin Tao.___1___
Lin Tao: Well, ___2___So I get up at 6:45.I never(从未)go to school late.Tom: Do you have breakfast at home? Lin Tao: Yes, ___3___.Tom: And when do you go to school?
Lin Tao: Class begins at 8:00, so I go to school at 7:45, _4_____ Tom:___5___ Lin Ta o: I leave school at five and I get home at 5:15.答案:1.____ ____2._______ 3.________ 4._________ 5.__________
B)填入适当的词语或句子完成对话(10分)(每空2分)A: 1¬¬¬¬________________________________?
B: Yes, please.2_____________________ a pair of shoes.A: 3________________________ do you want? B: Black.A: What about this pair?www.xiexiebang.com
B: They look nice.4____________________________________? A: They are thirty dollars.B: I’ll 5____________________.Thank you.A: You are welcome.V.用括号内单词的适当形式填空。(10分)(每空1分)1.I don’t like ___ _______________(comedy).2.Do you want _____________(go)to a movie?
3.Mary _____________________(not do)homework today.4.Thursday is the ____________________(five)day of a week.5.They often go out _________________(eat)with Mr.Green.6.Can you help kids with _____________________(swim)? 7.We want two good ________________________(music).8.Liu Xiang is a great _____________________(run)star.9.____________ your friend _______________(like)soccer? 10.________________(she)favorite color is white.Ⅵ.翻译句子(15分,1—7题每题1分,8—11题每题2分。)1.我的姑姑喜欢看电视。
My aunt _____________________________ TV.2.你想了解中国历史吗?
Do you want to learn about ____________________________? 3.你会下棋吗?
Can you __________________________________? 4.我喜欢健康食品。I like __________________________________.5.我最喜爱的水果是苹果._______________________________________ is apples.6.你几点上学?
__________________________ do you go to school? 7.这是我的全家福.This is ____________________________ ____________.8.这裤子多少钱?
_______________________________________________? 9.谢谢你的来信。
_______________________________________________.10.我的生日是8月31日。
____________________________________________________________.11.你喜欢哪种电影?
____________________________________________________________? Ⅶ.书面表达(20分)
A)某校要举办一届艺术节,需要唱歌、舞蹈、弹钢琴,打鼓的音乐人,请你写一个招聘海报。联系人:Miss Zhang,电话号码:88324733。(5分)
_______________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________
B)假设Sally是你的好朋友,请根据下面表格提示,以My good friend为题,写一篇80词左右的短文,介绍一下Sally,可适当发挥。(15分)Name Age Birthday club Likes Family members Sally 14 November,29th music;English books;tennis;
strawberries;hamburgers father(doctor)mother(English teacher)brother,(student)
___________________________________________________________________ ______________________________________________________________________________________________
2012—2013学第一学期期末考试 英语七年级试题答案
I.单项选择 ABBDA DCBBC DDBCD BCCCD II.完型填空 BABDB AACDB
4.He works in the hotel.5.There are 120 room s.F).1.I have bread and milk for breakfast.2.No, I’m not.3.At around twelve, I come home for lunch.4.After school, I do my homework and play with other children.5.He goes to bed at midnight.IV.补全对话新 A)E F G B C
B)1.Can I help you?/ What can I do for you?
2.I want/ I’d like 4.How much are they?
3.What color 5.take them
V.用括号内单词的适当形式填空。1.comedies 2.to go VI.翻译句子。
8.How much are the pants? /What’s the price of the pants? 9.Thanks for your letter./ Thanks for writing to me.10.My birthday is August 31st.11.What kind of movies do you like?
2012—2013学第一学期期末考试 英语听力试题(七年级)参考答案 听力部分(共四大题,计20分)I.Sentences(句子理解)
3.doesn’t do 4.fifth
5.to eat
6.swimming 7.musicians 8.running 9.Does;like 10.Her 1—5 BCCCA
II.Responses(问句应答)6—10 ACCBB
III.Dialogues(对话理解)11—15 BCACB
IV.Passages(短文理解)
16.England 17.People/ People’s 18.4:00 pm 19.20 20.867-1543
第三篇:七下英语配套练习册答案--Word
七年级下人教版英语练习册答案
Word Unit 1 A 一.1.country 2.Canada 3.Japan 4.Australia 5.French 6.language 7.pal 8.live 9.United 10.Singapore 二.1~5ABDBB 6~10CAACD 三.1.is from 2.does live lives 3.langaage speak speaks 4.Chinese speaks Japanese 5.Are from they are 四.1~5EFBDA B 一.(A)1.write 2.favorite 3.difficult 4.world 5.want(B)6.for 7.in 8.to 9.from in 10.in 11.with 12.in 13.from in 14.in 15.to on 二.1~5CCAAC 6~10DCADC 11~15CBBDB 三.speak seaks French 2.think interesting 3.a little 4.write letters to parents about 5.play sports on 四.1.name 2.No.25 3.I’m 4.Chinese 5.football 6.history 7.English 8.too 9.Jackie Chan 10.yourself Unit
section
A 一.(A)1.library2.restaurant3,supermarket4.bridge5.post office6.Avenue7.neighborhood(B)8.between9.on the left10.across from11.in front of12.on13.behind14.next to15.in 二.1~5CBCBC 6~10CDCCC 三.1.Where are2.is a bridge3.Yes there is4.Are there any5.There are two small restaurant in the neighborhood 四.1.Excuse2.on3.next4.near5.isn’t6.nighborhood7.turn8.on9.across10.welcome Section B 一.1.(A)1.small2.quiet3.beginning4.thrugh5.dirty6.hungry7.way8.garden9.visit10.tour 二.1~5BABBA 6~10BABCA 三.1.Go down turn left2.have a good trip 3.know 4.with next to5.tell the way 四.1.is 2.post office3.between4.across from5.down6.on7.bank 五.1~5CBACD6~10ACABC Unit
section
A 一.A)1.has 2.are watching 3.playing 4.did 5.bought
(B)6.fight 7.outside 8.classroom 9.else 10.hall
二. CBDCD
三.1Can eat 2.Come to 3.No don’t 4.Don’t listen 5.other things
四 1.thoes rules 2.sports shoes 3.arrive late for 4.in the dining hall 5.at classroom outside
五.CAFDE
Section B 一.(A)1.on 2.to 3.from to 4.at on 5.in by
at(B)6.children 7.talking 8.any 9.her 10.speaking
二.1~5.DCABC 6~10.CDADD
三.1.Do have to 2.Don’t run 3.Can play 4.have fun 5.can’t have to 四.1.Do you usually help your mom make dinner? 2.Don’t talk loudly in the classrooms!3.I have to go to bed by 10 o’clock.4.Do have to go to the Children’s Palase to learn the paino? 5.Can you meet friends at night? 五.1~5.CABDA 6~10CBDCA 六.Welcome to School Library 2.Don’t take your food into the libray or eat in here.3.它们会使书本潮湿。4.Three weeks 5.If you lost them,you have to play for them-------either pay money for them or buy the some books.期中综合练习
1.across 2.hospital 3.magazines 4.camera 5.snows 二.1.us 2.friendly 3.begining 4.Children’s 5.surprised 三.1~5 BBCCC 6~10 CDDBA 11~15.DDCCC 四.1.aren’t any 2.Does have 3.What does 4.Why do 5.What does 6.What’s doing 7.is doing 8.does do 9.What’s like 10.having a good time 五.1.What are you doing 2.Do you have a pen pal 3.Where does she from 4.Are there any famous animals 5.What’s the weather in Australia 六.DBCAC BACCD 七.BCBAC 6.David is 12 years old 7.Beause it can make him get up early to take exercise 8.Three 9.香水10.On the table 期末综合练习
(一)1.height 2.dinner 3.pratice 4.Geography 5.loudly
2.1.colorful 2.writes 3.potato4.wearing 5.talking
3.BCCCD ACBAD CBBDC 4.
1.Were any 2.didn’t play 3.doesn’t have 4.Don’t arrive 5.didn’t do
6.What would
7.Who does 8.How like 9.would like 10.Don’t take
5.GCFED
6.DBADC BCBCA
7.DBCBA 8.
1.He is a reporter.2.Because he thinks they are interesting 3.Sports News 4.He thinks the coolest thing is the sungiasses 5.He doesn’t like game shows or wallets.期末综合练习
(二)一.1.popular 2.expensive 3.agree 4.garden 5.build
二. 1.cloudy 2.went 3.singer 4.washed 5.us
三.BDADC BDACC CCBBD
四.1.Does have 2.didn’t went 3.doesn’t or 4.Were any 5.he didn’t 6.Why does 7.How were 8.Where does 9.How was 10.to me
五.1.goes shopping 2.wrote to 3.help me 4.for joining 5.arrived late
六.1.Where does he come from 2.What does he look like 3.what does he like 4.Do you want to meet him 5.What is the weather in Toronto
七.BBABC DABBA
八.DCBDA BCDAB
1.They lived in a big city 2.Because it was a quiet and clean plase 3.No,it wasn’t 4.Everbody knows everybody ,People often come and see him and he often go and see them.5.Yes,he did
第四篇:九年级下册 青岛版《数学配套练习册》答案
青岛版数学练习册九年级下册参考答案
5.1第1课时
1.解析、图像、列表.2.17,5,37°.3.V=8x3.4.如y=3x.5.D.6.D.7.略.8.A—③,B—④,C—②,D—①.9.(1)略;(2)逐渐增加;(3)不同,在8 s~9 s;(4)15.10.(2)泥茶壶中水温降幅较大,稳定后的水温较低.第2课时
1.x≠2,x≥-23,-22.2.Q=40-10t,0≤t≤4.3.b=3.4.y=x2,0<x≤102.5.C.6.C.7.D.8.C.9.(1)全体实数;(2)x≤0;(3)全体实数;(4)x≠4.10.0≤x≤10,y=2.5x+10,10≤y≤35.11.-2≤a≤2.12.(1)m=n+19,1≤n≤25,n为整数;(2)m=2n+18;(3)m=bn+a-b,1≤n≤p,n为整数.第3课时
1.y=25x,0≤x≤20; 500+20x,x
>
20.2.(1)60
;(2)y=12x+10;(3)140.3.y=t-0.6,1.4,6.4.4.3.5.A.6.C.7.C.8.S=15t,0≤t≤1;52t+252,1<x≤3;
20,t>3.9.(1)自下而上填8,32;(2)57 h;(3)当t≥25时,y=-t+57.10.(1)y1=60x,0≤x≤10;y2=-100x+600,0≤x≤6.(2)当x=3时,y1=180,y2=300.两车距离为600-180-300=120.当x=5时,y1=300,y2=100,两车距离为600-300-100=200.当x=8时,y1=480,y2=0,两车距离为480.(3)当0≤x<154时,S=y2-y1=-160x+600;当154≤x<6时,S=y1-y2=160x-600;当6≤x≤10时,S=60x.5.2第1课时
1.-14,-14.2.y=20x,反比例,y≥40.3.B.4.C.5.不是.1³2≠3³13.6.y是x的反比例函数.7.(1)由xy=4³5=5³4=6³103=7³207=20.可知y是x的反比例函数,表达式为y=20x.如果y是x的一次函数,设y=kx+b,将x=4,y=5;x=5,y=4代入y=kx+b,解得k=-1,b=9.但x=6时,-x+9=x-6+9=3≠103,所以y不是x的一次函数;(2)将x=8,代入y=20xy=52.207-52=514,故预计产品成本定价可降低514万元;(3)将y=2代入y=20x,解得x=10,10-8=2.故还需投入2万元.第2课时
1.y=-52x.第二、四象限2.第四、第二.3.第一、三象限,k>0.4.a<-12.5.定义域不同,图象的形状不同;都不经过原点,当x<0或x>0时,y值随x值的增大而增大.6.C.7.C.8.A.9.m>2310.略.11.不会相交.否则,设交点为(x0,y0),则k1x0=k2x0=y0,k1=k2,矛盾.第3课时
1.y=2x.2.k=5,m=2,交点为-53,-3.3.D.4.C.5.A.6.(1)双曲线y=4x与直线y=x相交,且关于这条直线成轴对称;(2)双曲线y=4x与直线y=-x不相交,且关于该直线成轴对称.7.(1)k=-2,m=2;(2)0≠x<2时,y2>y1;x>2时,y2>y1.8.(1)A(1,1),B(1,0),C(-1,-1),D(-1,0);(2)2.9.P1(2,2),A1(4,0),A2(42,0).提示:设F为A1A2的中点,设A1F=m,则P2(4+m,m),m(m+4)=4,m=-2+22,OA2=42.第4课时
1.y=20x.2.6,0 A<20 A.3.3m.4.C.5.A.6.(1)1.98;(2)V增大时,ρ是V的反比例函数,随着V的增大,ρ变小.7.(1)y=80x;(2)0<x≤10;(3)20.8.(1)加热前的温度为30 ℃,加热后的最高温度为800 ℃;(2)设一次函数的表达式为y=kt+b.当t=0时;y=32.当t=1时,y=32+128=160.所以b=32,k=128,表达式为y=128t+32.令y=800,解得t=6.所以此时t的取值范围为0≤t≤6;(3)设反比例函数的表达式为y=kx,将(6,800),代入,得k=4800,故y=4800x.将x=480代入,解得y=10,此时t的取值范围为6<t≤10.9.(1)由xy=60,∴y=60x;(2)由y=60x,且x,y都是整数,故x可取1,2,3,4,5,6,10,12,15,20,30,60.∵2x+y≤26,0≤y<12,∴符合条件的围建方案为AD=5 m,DC=12 m,或AD=6 m,DC=10 m,或AD=10 m,DC=6 m.5.3 1.所
有
实
数
.2.a
≠-2.3.y=12x2.4.y=200x2+600x+600.5.D.6.C.7.B.8.A.9.(1)y=-x2+25x;(2)0<x<25;(3)是;(4)150 cm2.10.(1)y=6x2-5x-6;(2)y=2x2-5x+114.11.(1)y=240x2+180x+45;(2)长m,宽
0.5 m;12.(1)y=-500x+12 000人时,门票价格不低于20元/人.有门票价最低时,每周门票收入40 000元.5.4第1课时
1.第一、二.2.<.3.C.4.D.5.(1)S=116x2;(2)略;(3)4,x≥8.6.(1)y=-125x2;(2)5 h.7.(1)y=-x+2,y=x2;(2)3.第2课时
1.向下,x轴,(0,-5).2.y=3x2+1.3.右,2.4.直线x=3,(3,0),(0,36).5.x<-6,x>-6.6.C.7.A.8.A.9.B.10.(1)11;(2)向上平移11个长度单位;(3)(0,11);(4)(-2,-1)在图像上,(-2,1)不在.11.(1)向左平移2个长度单位;(2)开口向上,对称轴是直线x=-2,顶点(-2,0);(3)x<-2时,x>-2时;(4)有最低点,此时x=-2.12.校门所在抛物线表达式为y=-47x2+647,校门高约9.1 m.13.z=-2x2+2,x≤-1, 2x+2,-1<x≤0,-2x2+2,x>0;(2)当x=-1和x=22时;(3)x≤0时,x>0时.第3课时
1.向下,直线x=1,(1,5),最高点.2.左,2,下,3.3.1,2,-1.4.<2,>2.5.高,(2,-3).6.B.7.C.8.B.9.C.10.y=3(x+2)2-5.11.略.12.(1)向上,有最低点;(2)直线x=3,(3,-2);(3)当x>3时.13.a=-12.14.(1)略;(2)y=-2(x+2)-2=-2x-8;(3)y=1x+3-2;(4)y=x+2x-1=3x-1+1.故可由双曲线y=3x.向左平移1个单位长度,再向上平移1个单位长度而得到.15.(1)(1,2);(2)2;(3)(-1,-2),y=(x-1)2-2.第4课时 1.y=4(x-3)2-10.2.(2,-7),直线x=2,x>2.3.高,(-2,10).4.右,2,上,3.5.19,直线x=-1,(-4,19).6.D.7.A.8.D.9.D.10.D.11.开口向上,顶点(-1,-2),对称轴直线x=-1.12.(1)0<x<20;(2)对称轴是直线x=10,顶点(10,100).13.A(1,-3),B(0,-2),y=-x-2.14.(1,0).15.顶点(m,2m-1),总在直线y=2x-1上.5.5 1.y=x2-2x-1.2.y=-12x2-12x+1.3.0.4.y=
(x+
2)2-3=x2+4x+1.5.4.6.B.7.D.8.B.9.C.10.(1)y=x2+2x-1;(2)y=-x2+2x+1.11.(1)直线x=1,顶点(1,-1);(2)y=3x2-6x+2;(3)当x>1时,y随x增大而增大;当x<1时,y随x增大而减小;当x=1时,y有最小值-1.12.y=932x2-98x-278.13.(1)k=-2;(2)k=-2;(3)k=-5.14.(1)y=x2-4x+3;(2)(2-1),x=2;(3)设平移前后两条抛物线的顶点分别为P,P′,点A平移后的对应点A′,所求曲边四边形的面积等于A′APP′的面积,即1³2=2.5.6 1.两个公共点、一个公共点、无公共点,ax2+bx+c=0.2.两,(1,0),(-3,0),1,-3.3.上,(32,-92),下,两,有两个不同的实数根.4.C.5.A.6.(1)(2,0),(3,0),实数根为2,3;(2)x2-5x+6=2,即x2-5x+4=0的实数根.7.根的近似值为-1.6,0.6.8.(1)A(3,0),B(-1,0),C(0,-3);(2)92.9.k<-32.10.(1)由条件,抛物线与x轴交点横坐标为-1,-3,即方程两根为-1,-3;(2)设表达式为y=a(x+1)(x+3),由条件,a=±12,y=12x2+2x+32或y=-12-2x-32.11.(1)b=-4,c=4;(2)B(0,4),6+25.5.7第1课时
1.(1)y=7x2-20x+100;(2)0<x≤10,当x=107时,y=6007最小.2.(1)y=-4x2+64x+30 720;(2)增加8台机器时,最大生产量为30 976件.3.y=-0.02t2+0.16t,注射后4 h浓度0.32 mg/L最大.4.C5.B 6.(1)应涨价5元;(2)涨价7.5元时,获利最多,为6 125元.7.(1)y=-500x+14 500;(2)p=-500x2+21 000x-188 500,当x=21时,p最大.8.(1)23 800 m2;(2)当GM=10(m)时,公园面积最大.第2课时
1.(1)y=53x2;(2)约2.3 m.2.56,2512.3.5<m<4+7.4.B.5.D.6.(1)足球落地的时间;(2)经2 s,足球高19.6 m最高.7.(1)43 m2;(2)S=-x2+2x,当x=1(m)时,S最大;(3)当x=l8时,S最大.8.(1)M(12,0),P(6,6);(2)y=-16x2+2x;(3)设OB=m,则AB=DC=-16m2+2m,BC=12-2m,AD=12-2m,l=AB+AD+DC=-13m2+2m+12,当m=3(m)时,l=15(m)最大.第五章综合练习
1.x≤32,x≠-1.2.k=-8,b=-4.3.向上,(-2,-5),直线x=-2,-2,小,2个,-2+102,0,-2-102,0.4.1,-6,12.5.C.6.C.7.D.8.C.9.B.10.(1)y=-x+2;(2)S△AOB=S△AOM+S△BOM=6,其中M为AB与x轴交点.11.(1)a<0,b<0,c>0,b2-4ac>0,a-b+c>0;4a2-2b+c>0;(2)1,-3;(3)x>1或x<-3;(4)x≥-1;(5)k<4.(6)这时函数表达式是y=ax2+bx+(c-4);(2)根为x=-1;(3)解集为x≠0;(4)仍为x≥-1;(5)变为k<0.12.(1)A(-3,0),B(-43a,0),C(0,4);(2)AB=3-43a,BC=169a2+16=43a1+9a2,AC=5;(3)(4)分三种情况:①若AB=AC,a=-23,y轴不是对称轴(43+3a≠0);②若AB=BC,a=-87,y轴不是对称轴;③若AC=BC,a=-49,y轴是对称轴.13.(1)y=34(x-2)2-3,另一交点(4,0);(2)6个整点:(1,-1),(1,-2),(2,-1),(2,-2),(3,-1),(3,-2).14.(1)3个月;(2)y=12(x-1)2-2;(3)9月;(4)(0,-32).检测站
1.-6,4.2.(2,-3).3.如
y=-(x+1)2+1.4.(5,0).5.直
线x=1,-15.6.C.7.B.8.D.9.B.10.(1)略;(2)-1<x<3;(3)y=12(x-4)2-2.11.(1)A在C2上,因(t+1)2-2(t+1)+1=t2;A(t+1,t2);(2)B(1,0).a(1-t-1)2+t2=0,t2(a+1)=0,a=-1.12.设A1m,m,则B3m,m故AB=2m,四边形ABCD为矩形,面积为2m²m=2,为定值..13.(1)y=18x2+x;(2)当BP=4 cm时,CQ=2最大.6.1 1.不能.2.略.3.D.4.D.5.不能肯定,甲中靶的可能有性大6.略.7.甲、乙均合格;甲合格,乙不合格;甲不合格,乙合格.8.实际上,指针所指的数字的2倍就是最后的扇形的数字,所以是偶数.6.2 1.7.2.3,0.12.3.18,0.45.4.10,0.2.5.36%.6.A.7.D.8.C.9.(1)1,2,5,6,4,4,3,2,4;(2)6÷36≈16.7%,3÷36≈8.3%,4÷36≈11.1%.10.(1)频率分别是:0.075,0.5,0.3,0.1,0.025;(2)认为表现满意的占87.5%,班长可以留任.11.(1)a=8,c=0.3,b=12;(2)12个.12.(1)34%;(2)1 200人;(3)A=600,B=0.35,C=0.06;D=2 400;(4)2本.6.3第1课时
1.(1)160;(2)160名学生的视力;(3)0.25;(4)1 250.2.(1)第一行:10,25,30,50,第二行0.25,0.1,1;(2)10,20,25,30,10,5.3.C.4.B.5.略.6.(1)40人;(2)0.05,0.225,0.25,0.35,0.125;(3)在第3组中;(4)落在第3或第4组中.7.(1)50名;(2)参观博物馆人数为10名;(3)约160名.第2课时
1.(1)表中频数240,频率为0.12,0.36,0.24,0.2,0.04;(2)6倍.2.C.3.D.4.略.5.(1)100名;(2)36°;(3)“娱乐”频数40,“阅读”频数30,“其他”频数10;(4)略.6.(1)a=12,频率依次为:0.12,0.16,0.24,0.36,0.12;(2)略;(3)第3组;(4)88%,12%.6.4第1课时
1.(1)不是;(2)略.2.略.3.略.6.5第1课时 1.0.5.2.6.3.A.4.32+63+88+115+155+18150+100+150+200+250+300个.5.950粒6.略.第2课时
1.0.3,0.3,0.4.2.6,4,2.3.9.4.A.5.B.6.13.7.乙、丙、丁均可行.8.(1)68,0.74,0.68,345,0.70,0.70;(2)0.70;(3)252°.9.(1)不公平.P(阴)=59,小莹胜的概率为59;(2)略.6.6第1课时
1.12.2.13.3.B.4.(1)310,25.5.16.6.10.第2课时
1.50万分之一.2.3690=25.3.B.4.(1)150;(2)40.5.如果小莹摸的是红球,则小亮摸到红球的概率为23,否则为79.6.(1)12;(2)答案不唯一.如指针停止时,指针指向的区域上的数字小于7;或区域上的数不能被3整除等.第3课时
1.13.2.13.3.C.4.1号板:14;2号板:18;3号板:18.5.14.提示:菱形面积为24 cm2,△APC的面积等于6 cm2时,其高等1.5 cm.作平行于AC距AC1.5 cm的两条平行线,菱形在平行线之外的面积之和为6 cm2.所以所求的概率为624=14.6.(1)14.提示:点P的横、纵坐标各有1,2,3,4四种等可能选择,共有4³4=16种选择,其中P的(1,1),(1,2),(2,1)(2,2)四种选择,使P落在正方形ABCD中.≈
0.60;(2)606.7第1课时
1.34.2.C.3.(1)12;(2)34;(3)34.4.(1)14;(2)34.5.(1)P(小莹胜)=12;(2)公平.第2课时
1.13.2.16.3.C.4.D.5.(1)6对;(2)16.6.110.7.(1)310;(2)310;(3)925.第六章综合练习
1.(1)33名;(2)233,533,411,1033,433;(3)约42.4%.2.π4.3.C.4.B.5.(1)96,30.8,30.4;(2)略;(3)白球多;(4)0.3,3个红球.6.(1)11,0.275;(2)略;(3)总收入22 725(元).7.(1)136;(2)136.8.(1)E点可能性最大,概率为13;(2)C点和A点可能性都最小,概率均为16.检测站 1.12.2.(1)
50;
(2)0.14,0.6,0.2,0.06.3.D.4.C.5.(1)45;(2)1625.6.P(小莹得分)=59,不公平.修改意见:如两次颜色相同或配成紫色,则小莹得4分,否则小亮得5分.7.1 1.都是一条线段绕一条直线旋转形式的几何体,都至少有一个面是圆,都有一个面是曲面.圆柱有两个底面是圆,圆锥只有一个底面是圆,圆柱没有顶点.圆锥有一个顶点.圆柱沿轴线的截面是矩形,圆锥沿轴线的载面是等腰三角形.2.8.3.C.4.B.5.6个.6.(1)等腰三角形;(2)1111a2.7.(1)16,21;20,17;19,18;(2)41.7.2第1课时
1.2,5.2.18,48 cm,48 cm2,(48+123)cm2.3.C.4.D.5.C.6.(1)三种:5³4³6,10³4³3,5³8³3;(2)其中10³4³3表面积最大,为164 cm2.7.(1)429 cm;(2)3 200 cm2.8.略.第2课时
1.10a2,14a2,(4n+2)a2.2.C.4833.C.4.13.5.点P,Q,R
在展开图位置如图,S△PSQ=52a2-58a2-38a2-12a2=a2.6.第一条路径长为12+(2+1)2=10≈3.16,第二条路径长322+1+322= 1216+23≈2.21,所以第二条路径较短.7.3第1课时
1.ab2π,2ab π,2b(a+b)π.2.100 cm,31.4 cm.3.B.4.B.5.D.6.180 000π cm2.7.4π8.设容器底面直径,即母线长为a,则S1=12a2π+a22πx2=a2π,S2=a2+2³12a2π+12a2π=a2³1+32π,∴S1<S2.第2课时
1.10π,100π2.2.18π.3.A.4.C.5.16π2+25.6.(1)r=3,h=12时,沿侧面的最短线长为9π2+122=3π2+16.而AC+CB=16,前者更短;(2)r=3,h=3时,沿侧面的最短线长为9π2+32=3π2+1,而AC+CB=9,后者较短.7.如图,把缠绕一周的带子展开,因为AB为管道侧面母线的一部分,所以CD也为管道侧面母线的一部分,且点A与点C重合,可得AD=2π,∠BAC=90°,(第7题)过点A作AH⊥BC,垂足为H,由带子宽度为1可知AH=1,∵∠BAH+∠B=90°,∠BAH+∠HAC=90°,∴∠HAC=∠B=α.在Rt△AHC中,cos∠HAC=12π,∴cosα=12π.7.4第1课时
1.4,8.2.21π,30π.3.A.4.C.5.15π.6.32π+4πsin50°≈166.1(cm2).7.3πS3π.第2课时
1.3,1,22.2.3.3.B.4.C.5.20π+8π+4π=32π.(第6题)6.提示:作出圆锥的侧面展开图(如图).AA′的长=18π,B为AA′的中点,C是AB中点,∠APA′=120°,∠APB=60°,△ABP为等边三角形,AB=PA=27(cm).AC=13.53(cm)为A点到C点的最短距离.7.底面半径为28,高为1430.第七章综合练习
1.2n,3n,32n(3n-5).2.8个面,表面积550 cm2,体积750 cm3.3.18π.4.8.5.B.6.15π.7.C.8.B.9.B.10.4.5 m.11.2π.12.(1)417.0 cm2;(2)507.7 cm2.13.102.14.不能.设扇形和圆半径分别是R和r,则r+2r+R=2R,R=(3+22)r;如围成圆锥,则2 πR4=2 πr,R=4r,矛盾.15.h-b+aa.提示:设酒瓶下部圆柱的底面面积为S,则酒瓶容积为aS+(h-b)S,酒的体积为aS.检测站 1.球、圆锥、圆柱、四面体、直三棱柱、正方体.2.18.3.D.4.D.5.C.6.后者体积较大,分别为6 250 cm3和7 957.7 cm3.7.688.9 cm2.8.1 319.5 cm2.8.1 1.圆、椭圆、线段.2.B.3.B.4.8 m.5.(2)1 m.提示:设电线杆根部为P点,ABBM=OPPM,CDND=OPPN,EFGF=OPPG,GF为EF的影子,可得PM=10 m,OP=10 m,GF=1;(1)(3)略.6.如A′C′=C′B′,过C′作EF∥AB,E,F分别在直线OA′,OB′上,则C′E=C′F,△A′C′E≌△B′C′F,∠EA′C′=∠B′,但∠EA′C′>∠B′.矛盾.8.2第1课时
1.9.6.2.C.3.B.4.A.5.(1)略;(2)略.6.在阳光下,可能是正方形、长方形、平行四边形、线段;在灯光下,可能是正方形、任意四边形、线段.7.三角形或线段,原三角的重心的投影是投影三角形的重心,这因为平行投影保持线段中的比例关系.所以线段中点的投影是线段投影的中点,三角形中线的投影是投影三角形的中线,而重心将中线分为1∶2两部分,所以三角形重心的投影是投影三角形的重心.第2课时
1.矩形或三角形.2.正方体.3.D.4.D.5.平行;重合;两条平行线段的投影也可能是两个点,如BF和CG.6.可能是任意的平面图形.7.(1)可能相交也可能重合;(2)不可能,因为共点的线段的投影也共点;(3)不一定相交.第3课时 1.点.2.长方形,圆.3.D.4.D.5.B.6.(1)边长为10 cm的正三角形;(2)长10 cm宽6 cm的矩形.7.略.8.(1)面ABCD、面ADE、面BCF;面ABCD、面CDEF;(2)AD,BC;AB,CD,EF;(3)略.8.3第1课时
1.圆锥.2.直六棱柱.3.C.4.直角三角形,矩形,矩形.5.(1)A;(2)C;(3)F.6.略.第2课时
1.左.2.B.3.C.4.略.5.略.6.13个.7.45,一般地,第n个几何体的小立方体个数为2n2-n.第3课时
1.主,俯.2.48 π.3.C.4.B.5.最多5个,最少3个.6.3+2.7.(1)略;(2)表面积S=60π(m2),体积V=72π(m3);(3)4+32π(m).第八章综合练习
1.平行四边形,椭圆.2.圆锥.3.D.4.B.5.D.6.15.提示:利用相似三角形边的比例关系.7.8 m.8.略.9.略.10.9个.11.(1)主视图:;左视图:;(2)24;(3)26,.检测站
1.俯.2.长方体.3.D.4.(1)略;(2)线段.5.图略,底面积r=502-402=30(cm2).全面积S=πr2+2πr³50³12=2 400π(cm2).6.略.总复习题
1.x≥3,x≠5.2.-9.3.(2,2),(2+62,6-22).4.2,-3.5.16.6.C.7.-2.8.C.9.D.10.(1).y=5x,y=3x+2;(2)(-53,-3).11.y=-(x-1)2+16,交点(-4,-9),(6,-9).12.(1)6天,12天;(2)略;(3)72万元.13.(1)13;(2)29;(3)13,14.14.(1)12;(2)不公平,P(小亮胜)=58>12,可改为“小于32,则小亮胜”.15.(1)当2x=(24-2x)³22时,即当x=8时,包装盒是正方体,体积V=512(cm3);(2)S=2x2+2x³(24-2x)³22³4=-6(x-8)2+384.所以当x=8 cm时,体积最大为384 cm3.16.(1)略;(2)梯形;(3)45°;(4)以D点为坐标原点,射线DA为y轴方向,过点D作垂直于DA的直线为x轴,向上为x轴正方向.这段抛物线的函数表达式为y=4x2,0≤x≤0.5,0≤y≤1.总检测站 1.-12,-12.2.49.3.(-1,0)
.4.11 250.5.D.6.B.7.D.8.B.9.(1)y=2x+2ax;(2)略;(3)略;(4)当x=a时,周长最小,为4a.10.(1)150人,1 050人;(2)略.11.A1,A2,B1,B2,B3,C2,C3—矩形;A3—圆;C1—三角形;(2)1227.
第五篇:七年级数学配套练习册答案
一、填空(共20分)
1、最小的素数是(),最小的合数是()。2、18的因数有(),24的因数有(),它们的公因数有()。
3、在1~20的自然数中,既不是素数又不是合数的数有(),既是素数又是偶数的有()。
4、自然数按因数个数的多少可以分成()、()和()。5、1082至少加上()是3的倍数,至少减去()才是5的倍数。
6、一个数的最大因数是13,这个数的最小倍数是()。
7、两个自然数a、b的最大公因数是1,它们的最小公倍数是()。
8、如果A=2×2×3,B=2×3×3,那么它们的最大公因数是(),最小公倍数是()。
9、一个数是3的倍数,又是5的倍数,还有因数7。这个数最小是()。
10、一个数既是30的因数、又是45的因数,最大的是()。
11、用0、1、2三个数字排成的所有三位数中,同时是2、3、5的倍数的数有()。
12、如果两个数的最大公因数是1,它们最小公倍数是91,那么这两个数的和最大是()。
二、判断题(共5分)
1、两个连续自然数(0除外)它们的最大公因数是1。
(2、在24的因数中,是素数的只有2和3。
(3、5和7没有公因数,但5和7有公倍数。
()
4、所有的偶数都是合数。
()
5、两个数的公倍数一定比这两个数都大。
()
三、选择题(共5分)
1、任何两个奇数的和是()。A 奇数 B 合数
C 偶数))
2、两个素数的积一定是()。A 素数 B 合数
C奇数
3、任何两个自然数的()的个数是无限的。A 公倍数 B 公因数 C 倍数
4、A是B倍数,那么它们的最小公倍数是()。A AB B A C B
5、两个数的最大公因数是15,最小公倍数是90,这两个数一定不是()。A 15和90 B 45和90
C 45和30
四、写出每组数的最大公因数(共12分)32和1 12和18 72和48
78和117 23和60
12和60
五、写出每组数的最小公倍数(共12分)
4和15和7
9和15
13和39
六、列式计算(共8分)
1、一个自然数被3、5除都余1,这个数最小是多少?
90和30 6和132、五个连续奇数的和是425,最小的一个是多少?
七、解决问题(共38分,第8题3分,其余每题5分)
1、一枝钢笔的价钱是18.6元,比一枝圆珠笔贵10.9元,一枝圆珠笔多少元?(列方程解答)
2、小明的妈妈比小明大26岁,爸爸今年38岁,比妈妈大4岁,小明今年多大了?
(列方程解答)
3、甲、乙两人到图书馆去借书,甲每4天去一次,乙每5天去一次,如果7月1日他们两人在图书馆相遇,那么他们下一次同时到图书馆是几月几日?