(x-1)²-2y(x-1)+y²因式分解

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(x-1)²-2y(x-1)+y²因式分解

(x-1)²-2y(x-1)+y²因式分解
(x-1)²-2y(x-1)+y²因式分解

(x-1)²-2y(x-1)+y²因式分解
(x-1)²-2y(x-1)+y²
=x²-2x+1-2xy+2y+y²
=x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=[(x-y)-1]²
=(x-y-1)²