分解因式9-x^2+2xy-y^2

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分解因式9-x^2+2xy-y^2分解因式9-x^2+2xy-y^2分解因式9-x^2+2xy-y^29-x^2+2xy-y^2=9-(x-y)^2=[3-(x-y)][3+(x-y)]=(3-x+y

分解因式9-x^2+2xy-y^2
分解因式9-x^2+2xy-y^2

分解因式9-x^2+2xy-y^2
9-x^2+2xy-y^2
=9-(x-y)^2
=[3-(x-y)][3+(x-y)]
=(3-x+y)(3+x-y)