1.（x+y）²-(x+y)³

题目

1.（x+y）²-(x+y)³
2.（x-y)²-（x-y)³
3.(x-y)²-（y-x)³
4.2（x-y)-3（y-x)²
5.4ab(a+b)²-6a²b(a+b)
6.(x+y)²（x-y)+（x+y)（x-y)²
7.2a(a-3)²-6a²（3-a）+8a(a-3)
8.24xy²z²（x+y-z)-32xyz(z-x-y)²+8xyz³（z-x-y)

答案

解1题原式=(x+y)²-(x+y)³=(x+y)²[1-(x+y)]=(x+y)²(1-x-y)2题原式=(x-y)²-(x-y)³=(x-y)²[1-(x-y)]=(x-y)²(1-x+y)3题原式=(x-y)²-(y-x)³=(x-y)²+(x-y)³=...