Question

（x+y）立方－（x+y）(x－y)平方 怎么算

Answer 1

（x+y）立方－（x+y）(x－y)^2
=(x+y)[(x+y)^2-(x-y)^2]
=4xy(x+y)

Answer 2

（x＋y）³－(x－y)²(x＋y)
=(x＋y)(x＋y)²－(x＋y)(x－y)²
=(x＋y)[（x＋y）²－(x－y)²]
=(x＋y)2x2y
=4xy(x＋y)