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两数和的平方

两数和的平方. 执教：王宏官. 泰州实验学校. b. a. 空间图形. a > b. 旋转. a. b. (a-b) 2. =. a. b. ab. a 2. b 2. ab. 试一试, 你也能行！. (a-b) 2 =?. _. +. ( a-b) 2 = a 2 - 2ab + b 2. 课堂小结. （1 ）本节课学习了 ( a ± b) 2 =a 2 ± 2ab+b 2 两个乘法公式. （2 ）通过本节课的学习，我们还进一步体会了 数与形 之间的相互关系， 整体与部分 的数学方法. 处处留心皆数学. 谢谢大家！ 再见！.

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两数和的平方

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  1. 两数和的平方 执教：王宏官 泰州实验学校

  2. b a 空间图形 a>b 旋转

  3. a b (a-b)2 = a b ab a2 b2 ab 试一试, 你也能行！ (a-b)2 =? _ + (a-b)2 =a2 - 2ab + b2

  4. 课堂小结 （1）本节课学习了(a±b)2=a2±2ab+b2两个乘法公式 （2）通过本节课的学习，我们还进一步体会了数与形之间的相互关系，整体与部分的数学方法

  5. 处处留心皆数学 谢谢大家！ 再见！

  6. 试一试！ 明辨是非： • (3a+5b)2=9a2+25b2 • (a-b)2=a2-b2 • (3a-2b)2=9a2-6ab+4b2 • (3a-2b)2=9a2+12ab-4b2 • (-x2-2y)2=x4+4x2y+4y2

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