(x-y)平方+2x-2y 因式分解

问题描述:

(x-y)平方+2x-2y 因式分解

[x-y]乘[x-y]+2[x-y]
[x-y+2]乘[x-y]

提取公因式(x—y)得:(x-y)(x-y+2)