(x-y)方-(x+y)(x-y) 等于
问题描述:
(x-y)方-(x+y)(x-y) 等于
答
(x-y)方-(x+y)(x-y)
分解因式:=(x-y)(x-y-x-y)
=(x-y)(-2y)
= -2y(x-y)