4(x-y)2-4x+4y+1因式分解
问题描述：
4(x-y)2-4x+4y+1因式分解
答
= [2(x-y)]^2 -4(x-y) +1
= (2x-2y-1)^2
4(x-y)2-4x+4y+1因式分解
= [2(x-y)]^2 -4(x-y) +1
= (2x-2y-1)^2