(x+2y)^2-2(x+2y)+1怎么分解因式?,
问题描述:
(x+2y)^2-2(x+2y)+1怎么分解因式?,
答
=(x+2y-1)^2
答
(x+2y)^2-2(x+2y)+1
=(x+2y-1)^2