因式分解:-x^2+2xy-y^2

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

因式分解:-x^2+2xy-y^2
因式分解:-x^2+2xy-y^2

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

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

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