已知(x-y)2-2x+2y+1=0,则(x-y)^3是多少

问题描述:

已知(x-y)2-2x+2y+1=0,则(x-y)^3是多少
如题,要有过程!

(x-y)²-2(x-y)+1=0
(x-y-1)²=0
x-y-1=0
x-y=1
(x-y)³=1