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1、平行四边形的面积济源市文昌路小学李小霞教学内容：人教版小学五年级数学上册平行四边形的面积计算。教学目标：1、通过操作、观察、比较，自主探索、动手实践推导出平行四边形面积计算公式，渗透转化的思想，发展学生的空间观念。2、能正确地应用公式计算平行四边形的面积。教学重点：探究并推导平行四边形面积的计算公式，并能正确运用。教学难点：平行四边形面积的计算公式推导教学准备：多媒体课件、平行四边形纸片、剪刀、三角板等。教学过程：一、复习引入，知识铺垫。复习学过那些平面图形提问：你学过哪些平面图形？在我们的教室里都有哪些图形？你会计算哪些图形的面积?那请你说一说长方形和正方形的面积怎么计算？板书：长方形的面积
2、=长宽二、创设情景，导入新课。出示一个长方形和一个平行四边形，这对好朋友发生了争论了，它们都说是自己的面积要大，你们认为谁的面积要大呢？你是怎么知道谁的面积大呢？学生在猜测中明白：必须准确的知道两个图形的面积才能进行比较。可是学生只会计算长方形的面积，那么这节课我们就来研究平行四边形的面积，及时点出课题并板书课题：平行四边形的面积三、动手实践，探究发现（一）利用方格，初步探究1、以前用数方格的方法得到了长方形和正方形的面积，用数方格的方法能得到平行四边形的面积吗？一起来试一试。课件出示：比较两个图形的大小，然后引进格子图）师：请你们来数一数比较一下它们的面积是多少？（1 小格代表 1 平方厘米
3、，不满 1 格的都按半格计算。）2、同桌交流一下方法。3、通过数方格你发现了什么？（生：我发现平行四边形的底和长方形的长相等，平行四边形的高和长方形的宽相等，平行四边形的面积和长方形的面积也相等。4、小结：（指图）通过数方格我们发现，平行四边形的底和长方形的长相等，平行四边形的高和长方形的宽相等，平行四边形的面积和长方形的面积也相等。这是一种巧合呢？还是平行四边形和长方形之间真有某种联系呢？通过下面的学习你一定会明白。如果，用数方格的方法可以得到这个平行四边形的面积，现在我想得到一个很大的平行四边形花坛的面积，你认为数方格的方法怎么样？有没有合适的方格文档编码:CL1U5S4C4A6 HI7K
4、9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文
5、档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K
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9、档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K
10、9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3纸呢？那么，能不能找到一种方法，适用于计算所有平行四边形的面积呢？我们试试看！（二）动手操作，深入探究1、介绍材料老师为每组准备了4 个不同的平行四边形，我们就利用剪刀、三角板等学具，完成下面的深入探究活动。寻找平行四边形面积的计算方法。2、活动要求：（1）思考：动手操作前建议大家先想一想：怎样才能得到这个平行四边形的面积呢？能不能把它变成以前学过的图形呢？怎么变？想好了吗？（2）活动步骤我们的“深
11、入探究活动”，分三步进行：第一步：动手操作。为了剪拼的规范，建议大家用铅笔和三角板先画一画，再剪拼。第二步：结合剪拼过程，思考这三个问题：大声读出来！通过剪一剪，拼一拼，我们把平行四边形变成了什么图形？剪拼后的图形与原来的平行四边形相比，什么不变？”剪拼后的图形各部分和原来平行四边形各部分之间有什么关系？第三步：把你的剪拼方法及你对这三个问题的思考和小组同学进行交流。明白了吗？比比看，哪个小组进行的又快又好！开始吧！3、学生活动，教师参与。文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4
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18、Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3请同学把剪拼后图形贴在黑板上，并在黑板前交流剪拼方法和对三个问题的思考。4、汇报交流（1）汇报剪拼过程。我们先请这几个同学和大家交流一下他的剪拼方法。请你们一边演示，一边说说你的剪拼过程。指导规范叙述：生 1：我把平行四边形沿高剪下一个直角三角形，向右平移，能拼成一个长方形。）生 2：我把平行四边形沿高剪下一个直角梯形，向右平移，也能拼成一个长方形。）生 3：我把平行四边形沿高剪下两个直角三角形，其中一个向右平移，能拼成一个长方形。）（板书：沿高剪平移）并追问：为什么要沿高剪？（生：只有沿高剪，才能把平行四边形
19、变成长方形。）请大家也像他们三个那样，一边操作，一边说说你的剪拼方法。课件演示剪、拼过程。（2）汇报深入探究的三个问题。结合剪拼过程，谁来这儿边指图形边说说你对这三个问题的思考？（生：通过剪一剪，拼一拼，我们把平行四边形变成了长方形。剪拼后的长方形与原来的平行四边形相比，面积不变。剪拼后的长方形的长和原来平行四边形的底相等，长方形的宽和平行四边形的高相等。）追问：你怎么知道平行四边形的面积和剪拼后的长方形面积相等？请每位同学选一种你喜欢的剪拼方法，像刚才两位同学一样，说说你对这3 个问题的思考。（同时，师板书：平行四边形的面积底 高）文档编码:CL1U5S4C4A6 HI7K9R4O1B6 Z
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24、A9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5
25、S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 Z
26、A9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3（三）总结方法：刚才大家在剪拼的时候，都把平行四边形变成了长方形，这种方法，是一种很重要的数学思想方法转化。（板书：转化）通过转化，我们可以找到新旧知识之间的联系，从而解决新问题。相信大家在今后的学习中会不断运用这种方法。（四）小结提炼，推导公式1、刚才我们通过剪拼，把平行四边形转化成了长方形。我们发现：（生齐说：长方形和原来的平行四边形面积相等。长方形的长和原来平行四边形的底相等，长方形的宽和平行四边形的高相等。）
27、你能不能根据长方形的面积公式，总结出平行四边形的面积公式？2、谁说说看？（生：平行四边形的面积等于底乘高。）为什么呢？（生：因为长方形的面积等于长乘宽。）（同时师补充完整板书。）请大家把公式读一遍。3、如果用字母 S表示平行四边形的面积，用a 来表示平行四边形的底，h 表示平行四边形的高，那么，平行四边形的面积用字母表示公式是？（生：S=ah）反问：那要计算平行四边形的面积，必须知道什么？（平行四边形的底和高）4、小结：通过剪拼，把平行四边形转化成了长方形，还总结出了平行四边形的面积计算公式！下面让我们带着我们的收获来解决问题！相信你们一定没问题！四、巩固新知文档编码:CL1U5S4C4A6
28、HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C
29、4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6
30、HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C
31、4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6
32、HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C
33、4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6
34、HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z31、求下列平行四边形的面积？提示：计算面积时，要先写字母公式，再计算噢！2、判断、选择题。3、一个平行四边形和一个长方形面积都是72 平方厘米，长方形的长是18 厘米，是平行四边形高的2 倍，平行四边形的底是多少厘米？五、全课小结，（提问总结）1、通过这节课的学习，你学到了哪些知识？2、平行四边形面积公式是如何转化成长方形，得出公式的？六：布置作业：一个长方形木条框,拉住它的两个对角,使它变
35、成一个平行四边形。想一想：面积变化了吗？怎样变的？做个实验验证一下。板书设计平行四边形的面积长方形的面积=长宽|平行四边形的面积=底高用字母表示面积公式：S=ah文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI
36、7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z
37、3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI
38、7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z
39、3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI
40、7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z
41、3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3教学评价：学生能通过数格子的方法得出平行四边形的底和高分别和长方形的长和宽相等，为后面推导平行四边形面积公式打下基础。然后通过小组合作剪拼，交流汇报、自己剪拼、总结概括等活动推导出平行四边形面积公式
42、，使学生的空间观念得到发展，并渗透转化思想。并通过一定练习对新知识进行巩固，但基础练习题较少，需要改进。教学反思：本节课上，我根据学生的特点和自身的教学经验，对教材内容作出了丰富又恰当的补充，创设了适宜本节课的探究活动。整堂课注意激发学生的学习兴趣，注重学生主动参与，合作交流，动手操作，让孩子们在活动中学习，在学习中思考，在思考中成长。1、把数学知识的教学融于现实情境中。我通过主题图这一个情境，将新知的学习置于这一现实情景中，通过观察、比较、操作、推理和概括等活动，进一步加强数学知识与生活的联系，感受数学在生活中的作用，体会学习数学的意义与价值。文档编码:CL1U5S4C4A6 HI7K9R4
43、O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码
44、:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4
45、O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码
46、:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4
47、O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码
48、:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4
49、O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z32、充分发挥学生的主体作用，加强学生主观能动性的培养。整节课中，我给学生提供了探究交流的时间和空间，并创设多种教学活动，激发学生兴趣。例如在平行四边形面积计算方法推导过程中，老师先让学生独立思考，然后互相交流，最后动手操作，把平行四边形转化成长方形，推导出平行四边形的计算方法，在平等和谐的氛围中培养了学生的合作意识、团队精神和动手能力。3、有效的渗透了学习数学的一种重要的思想方法转化。在教学中，让学生经历
50、了观察、比较、操作、推理和概括这一过程，对学生以后学习三角形面积和梯形面积打下了良好的基础。4、充分利用小组合作这一课题的有效性，发挥学生的主体地位和主观能动性，加强师生合作、生生合作，培养学生的合作能力和交流能力。文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9L6M1C4Z3文档编码:CL1U5S4C4A6 HI7K9R4O1B6 ZA9