最新《整式的乘法课件PPT》PPT课件.ppt

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1、《整式的乘法课件PPT》问题:三家连锁店以相同的价格m(单位：元／瓶）销售某种商品，它们在一个月内的销售量（单位：瓶）分别是ａ，ｂ，ｃ．你能用不同的方法计算它们在这个月内销售这种商品的总收入吗？解法(一):先求三家连锁店的总销量,再求总收入,即总收入(单位:元)为:m(a+b+c)①解法(二):先分别求三家连锁店的收入,再求它们的和,即总收入(单位:元)为:ma+mb+mc②由于①和②表示同一个量,所以:m(a+b+c)=ma+mb+mc你能根据分配律得到这个等式吗?巩固练习：１.计算：(1)3a(5a-2b)(2)(x-3y)·(-6x)解(1)３a(5a-2b)=3a·5

2、a+3a·(-2b)=15a-6ab(2)(x-3y)·(-6x)=x·(-6x)+(-3y)·(-6x)=-6x+18xy单项式与多项式相乘时可先确定积的符号例：计算（１）２a·(3a-5b)(2)(-2b)(-4a+b)解（１）２a·(3a-5b)=2a·3a-2a·5b=6a-10ab(2)(-2b)(-4a+b)=2a·4a-2b·b=8a-2bshop.99114.com/50648237shop.99114.com/47869049shop.99114.com/48919163shop.99114.com/50666040shop.99114.com/482085

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