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)
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)