2xy²-x²-y²+1等于几,因式分解

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2xy²-x²-y²+1等于几,因式分解

2xy-x²-y²+1
=1-(x-y)²
=(1-x+y)(1+x-y)

2xy-x²-y²+1
=1-(x-y)²
=(1-x+y)(1+x-y)

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