帮我化简2道数学题
问题描述:
帮我化简2道数学题
①2a(a-b)³-a²(a-b)²
②7y(x-3y)²-2(3y-x)³
就做剩这两题了
注意分辨“²(平方)”和“³(立方)”
没办法,电脑显示这平方和立方不太好分辨
答
①2a(a-b)³-a²(a-b)²=a(a-b)²[2(a-b)-a]=a(a-b)²(a-2b)②7y(x-3y)²-2(3y-x)³=7y(x-3y)²+2(x-3y)³=(x-3y)²[7y-2(x-3y)]=(x-3y)²(10y-2x)=-2(x-3y)²(x-5...