x^2-y^2-2x+1 分解因式·高手请进
问题描述：
x^2-y^2-2x+1 分解因式·高手请进
答
(x-y)(x+y)-2x-1
答
x^2-y^2-2x+1
= (x^2 -2x +1) - y^2
= (x-1)^2 - y^2
=(x-1+y)(x-1-y)