2y(x-y)^2-(y-x)^3过程具体!

题目

2y(x-y)^2-(y-x)^3过程具体!
(1)2y(x-y)^2-(y-x)^3
(2)(m-n)^3+m（n-m）^2-n（m-n）^2

答案

(1)2y(x-y)^2-(y-x)^3
=2y(x-y)²+(x-y)³
=(x-y)²(2y+x-y)
=(x-y)²(x+y)
(2)(m-n)^3+m（n-m）^2-n（m-n）^2
=（m-n)³+m(m-n)²-n(m-n)²
=(m-n)²(m-n+m-n)
=2(m-n)³