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