(x+y)平方+2(x+1)+2y-1 因式分解

问题描述:

(x+y)平方+2(x+1)+2y-1 因式分解
RT

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