最新整式的乘法教学讲义PPT.ppt

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1、整式的乘法回顾旧知1同底数幂的乘法运算性质是什么？am•an＝am＋n（m、n为正整数）同底数幂相乘，底数不变，指数相加.2积的乘方运算性质是什么？(ab)n＝anbn（n为正整数）积的乘方等于各因数乘方的积.3幂的乘方运算性质是什么？（am）n＝amn（m、n为正整数）幂的乘方，底数不变，指数相乘.有两幅画，规格如下图所示：（单位米）（1）第一幅画的面积是米2（2）第二幅画的面积是米23ab22b3ab2×2b=(4×7)=28a7=[7×(-2)]例1:解：如图，王大伯有一块长方形菜地，他把这块菜地分为6个大

2、小相等的菜畦，每个菜畦的宽都是a米，长都是ka米，这块菜地的面积是多少？aakakakaS=解：2a·3ka=(2×3)ka·a=6ka2（平方米）答：这块菜地的面积是6ka2平方米例2：计算例3计算(-2a2)3·(-3a3)2观察一下，例3比例2多了什么运算？例2计算注意:(1)先做乘方，再做单项式相乘。(2)系数相乘不要漏掉负号例4：求单项式的积这里有三个单项式相乘，还可以利用上面的法则吗？解：shop.99114.com/51416036shop.99114.com/50658016shop.99114.com

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