因式分解:(x+y)³-x-y
问题描述:
因式分解:(x+y)³-x-y
³ 为3次方
答
(x+y)³-x-y
=(x+y)³-(x+y)
=(x+y)【(x+y)²-1】
=(x+y)(x+y+1)(x+y-1)