第一篇:高二数学公开课教案
高二数学公开课教案
授 课 人:刘晓红
时 间:2003年10月16日 地 点:高二(7)班 课 题:求曲线的方程 目的要求:
1.复习巩固求曲线的方程的基本步骤;
2.通过教学,逐步提高学生求贡线的方程的能力,灵活掌握解法步骤; 3.渗透“等价转化”、“数形结合”、“整体”思想,培养学生全面分析问题的能力,训练思维的深刻性、广阔性及严密性。
教学重点、难点:轨迹方程的求法 教学方法:讲练结合、讨论法 教学过程:
一、学点聚集:
1.曲线C的方程是f(x,y)=0(或方程f(x,y)=0的曲线是C)实质是 ①曲线C上任一点的坐标都是方程f(x,y)=0的解 ②以方程f(x,y)=0的解为坐标的点都是曲线C上的点 2.求曲线方程的基本步骤 ①建系设点; ②寻等列式; ③代换(坐标化); ④化简;
⑤证明(若第四步为恒等变形,则这一步骤可省略)
二、基础训练题:
221.方程x-y=0的曲线是()
A.一条直线和一条双曲线 B.两个点 C.两条直线 D.以上都不对
2.如图,曲线的方程是()
A.xy0 B.xy0 C.
xy1 D.
x1 y3.到原点距离为6的点的轨迹方程是。
4.到x轴的距离与其到y轴的距离之比为2的点的轨迹方程是。
三、例题讲解:
例1:已知一条曲线在y轴右方,它上面的每一点到A2,0的距离减去它到y轴的距离的差都是2,求这条曲线的方程。
例2:已知P(1,3)过P作两条互相垂直的直线l1、l2,它们分别和x轴、y轴交于B、C两点,求线段BC的中点的轨迹方程。
2例3:已知曲线y=x+1和定点A(3,1),B为曲线上任一点,点P在线段AB上,且有BP∶PA=1∶2,当点B在曲线上运动时,求点P的轨迹方程。
巩固练习:
1.长为4的线段AB的两个端点分别在x轴和y轴上滑动,求AB中点M的轨迹方程。
22.已知△ABC中,B(-2,0),C(2,0)顶点A在抛物线y=x+1移动,求△ABC的重心G的轨迹方程。
思考题:
已知B(-3,0),C(3,0)且三角形ABC中BC边上的高为3,求三角形ABC的垂心H的轨迹方程。
小结:
1.用直接法求轨迹方程时,所求点满足的条件并不一定直接给出,需要仔细分析才能找到。2.用坐标转移法求轨迹方程时要注意所求点和动点之间的联系。
作业:
苏大练习第57页例3,教材第72页第3题、第7题。
第二篇:高二数学公开课
高二数学公开课
某老师于5月17日(周五)上午第二节课在高二(2)班上数学公开课,课题为《利用导数研究函数的极值与最值》,请本组老师准时前往听课。
高二数学组
2013年5月16日
第三篇:高二英语公开课教案
高二英语公开课教案
Teaching aims
Get students to learn the useful new words and expressions in bold in this part:
Teaching important points
Get students to learn different reading skills.
Teaching difficult points
1.Develop students’reading ability.
2.Enable students to learn to talk about the life .
3.Let students learn to use comparing and contrasting when writing. Teaching methods
1.Task-based teaching and learning
2.Cooperative learning
3.Discussion
Teaching procudure;
Step I.Greeting
Step ⅡRevision
Review some new words and phrases in this unit
take uplose sight ofby a flash
sweep upbe back on one;”s feet
switch tobe lacking inprevious to
leave a good impression on sbslide into
Step ⅢReading
1.Scan the passage and find out the answers
1.Who wrote this e-mail?
2.Who is the e-mail for?
3.What is his e-mail?
4.How did he feel when he left his own time?
5.How did he get to the year 3008?
6.What did he notice first when he arrived in AD3008?
2.Explain some language points and the past participle used as the adverbial
1).take up /on/away/over/care of
If I didn”t take up the challenge, it would mean I failed
2).tolerate/put up with/stand/ bear
We cannot tolerate cheating in exams
3).be lacking in/lack for nothing/no lack of
The teacher said the child was lacking in confidence
= The teacher said the child lacked confidence
4).lose sight of/out of sight
catch sight of/ in sight
Her father didn”t leave until he lost sight of her
3.Read the passage carefully and fill in the blanks with proper words or phrases.Check the answers with the whole classDear Mun and Dad,I___my prize that was wan last year so that I could travel to the year AD3008.As I ___time lag, which is ___the jet leg, my friend, Wang ping gave me some green tablets.Then we got into a capsule though a small ___.a few minutes later, we arrived.In the new surroundings, I was hit by the ___ fresh air.My head ached.Wangping handed me a___ and said,‘put it on and it will make you feel much better”.I felt better ___.then I followed him to collect a havering carriage driven by computer.just when we reached what looked like a large market,I ____Wangping.he was ___into the center of fling carriages.Arriving at a strange-looking house.he showed me into a large, bright room.In the house I had a brief meal and a hot bath, exhausted,I ___bed and fell fast asleep.More news later from your loving son.Li Qiang
4.Read the passage aloud, pay attention to the rhythm and intonation Step Ⅳ Practise
If time permits.Do the exercises in WB P29.check the answers Step Ⅴ Homework
1.Learn all the useful new words and expressions in this part by heart.
2.Read the passage again after class and finish exercisesin WB
第四篇:高二英语公开课教案
高二英语公开课教案
By Quan Liling TEACHING MATERIAL: Lesson 30, Unit 8, SEFC2A CLASS: Class 248, Senior II TIME: Friday, November 15, 2003 TITLE: First aid
Ⅰ.Teaching aims: 1.Four skills: cut(n.);electric;container;pool;by mistake pay attention to;in a short while;running water;within;deal with;wound;safety;wire;out of one’s reach Grammar:Revise the mode verbs:must,should and ought to Ⅱ.Teaching focus and difficulties: 1.Talking about first aid;2.Retelling.Ⅲ.Teaching method: Prctising and explaination Ⅳ.Teaching tools: A set of multi-media equipment.Ⅴ.Teaching Procedures: Step 1: Revision Revise the dialogue in L.29 by asking a pair of students to act out a dialogue.Step 2: Presentation 1.Discuss some pictures of first aid;2.talk about first aid.Step 3: Reading 1.Ask the students to read the first sentences of each paragraph and try to tell me the main idea of each paragraph: 1)Description of first aid;2)Three important things to do;3)Common injuries and first aid in the home;4)You need more information.2.give the students some minutes to read the text and then do some exercise;3.Put up some information on the Bb,then talk about them: 1)Three important things to do: A.Check that thhe personca breathe;B.Try to start his breathe;C.Try to stop the bleeding.2)Three common injuries at home: A.animal bites:wash the wound under the cold running water.see a doctor at once.B.Burns:Cool the area of the skin at once.Put a piece of dry and clean cloth over the area of the burn.see the doctor.C.Cuts:Wash the area of the cut,dry it and cover with dry clean cloth.4.Deal with the language points in this part: 1)…you don’t have to be an doctor;
2)Check that the person can breathe.Open the pouth and make sure that no food at the back of the mouth;3)Lay the person on the ground;4)Here is some advice for dealing with common injuries;5)cool the are of skin at once.Step 5:Practice Retell the text one by one.Homework:Finish off the exercises on the Wb.
第五篇:数学公开课教案
数学公开课教案
教学时间:2014年3月19日(星期三)第六节课
任教班级:四年级(1)班
任教教师:xx
教学内容:四年级数学下册第三单元简便计算之第一课时《连减的简便计算》 教学目标:
1、知道从一个数里连续减去两个数可以改为减去两个数的和。
2、感受数学与现实生活的联系,能用所学知识解决简单的实际问题。
3、培养探索、研究数学问题的意识和能力。
教学重点:
一个数连续减去两个数时,可以减去两个数的和,也可以先减后一个数再减前一个数。教学难点:
根据具体的数据特点,选择灵活、合理的计算方法。
师生准备:
教师:多媒体课件学生:常规学习用具
教学过程:
一、游戏导入新课
师:我们来玩个对口令游戏好吗?
生:好。
师:我说一个数,你对的数要与我说的数的和能凑成整百。
过程略
师:怎样的两个数相加得整百数。
生:个位相加得10,十位相加得9的两个数相加得整百。
师:换游戏规则,你们对的数与我说的数的差是整百。
过程略
师:怎样的两个数相减得整百?
生:个位和十位上的数字相同的两个数相减得整百。
师:其实,我们计算时常常可以用凑整的方法来使计算更简便。下面我们就一起来解决一个问题,并在解决问题的过程中一起来探讨在连减中怎样使计算更简便。(板书课题:连减的简便计算)
二、自主探索,探究新知
1.课件出示例1情境图,提问:你能从图中获得哪些数学信息?要解决的问题是什么?
2.明白以后,就请你们小组讨论后用一个算式表达出来吧。(学生分组讨论列式 教师巡视)
3.指名学生汇报,并说说是怎么想的师板书:234-66-34234-(66+34)234-34-66
4.这3位同学用了不同的方法解决问题,讲得很有道理。那李叔叔到底还剩多少页没看呢?现在就请你们用自己喜欢的方法算一算。
5.指名汇报:你是用哪种方法进行计算的?请在黑板算式下写出。
6.比较三个算式的结果,你们发现了什么?(结果相同)
7.你觉得哪种方法更简单?
8.小结简便计算方法。
在计算连减时,有多种方法,①可以(从左往右)按顺序计算;
②可以把(减数)加起来,再从被减数里去减;
③还可以先减去(后面)的减数,再减去(前面)的减数。
这就是我们今天学习的连减的简便计算。
三、实际运用,深化知识
课件出示习题。
1.在○里和横线上填上适当的运算符号和数。
(1)868-52-48=868○((2)1500-28-28○272)
(3)415-74-74○26)
(4)684-(584+37)=684○2.选择最好的方法。
(1)800-138-162()
A800-138-162B800-138-162
=662-162=800-(138+162)
=500=800-300=500
(2)472-49-272()
A472-49-272B472-49-272
=472-(49+272)=472-272-49
=472-321=151=200-49=151
四、课堂总结
师:你们真棒!通过今天的学习,你们有什么收获?
点名汇报
师:老师今天也有很多收获,与同学们分享:在进行连减的计算时可以从左往右按顺序计算;可以把减数加起来,再从被减数里去减;还可以先减去后面的减数,再减去前面的减数。
这就是我们今天学习的连减的简便计算
五、布置作业
课件出示作业,学生独立完成。