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