(x+y)平方+2(x+1)+2y-1 因式分解RT

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(x+y)平方+2(x+1)+2y-1因式分解RT(x+y)平方+2(x+1)+2y-1因式分解RT(x+y)平方+2(x+1)+2y-1因式分解RT(x+y)²+2(x+1)+2y-1=(

(x+y)平方+2(x+1)+2y-1 因式分解RT
(x+y)平方+2(x+1)+2y-1 因式分解
RT

(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

(x+y+1)平方

原式=x^2+2xy+y^2+2x+1+2y=(x+1)^2+2y(x+1)+y^2=(x+1+y)^2

原式=(x+y)²+2(x+y)+1
=(x+y+1)²