因式分解1+2xy-x^2-y^2
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因式分解1+2xy-x^2-y^2因式分解1+2xy-x^2-y^2因式分解1+2xy-x^2-y^21+2xy-x^2-y^2=1-(x-y)^2=(1+x-y)(1-x+y)
因式分解1+2xy-x^2-y^2
因式分解1+2xy-x^2-y^2
因式分解1+2xy-x^2-y^2
1+2xy-x^2-y^2
=1-(x-y)^2
=(1+x-y)(1-x+y)
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