因式分解：x3+（y-1）x2-2xy-y2
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因式分解：x3+（y-1）x2-2xy-y2因式分解：x3+（y-1）x2-2xy-y2因式分解：x3+（y-1）x2-2xy-y2x3+（y-1）x2-2xy-y2=x^3+x^2y-x^2-2xy
因式分解：x3+（y-1）x2-2xy-y2
因式分解：x3+（y-1）x2-2xy-y2
因式分解：x3+（y-1）x2-2xy-y2
x3+（y-1）x2-2xy-y2
=x^3+x^2y-x^2-2xy-y^2
=x^2(x+y)-(x+y)^2
=(x+y)(x^2-x-y)
解:x3+(y-1)x2-2xy-y2
=x3+yx2-x2-2xy-y2
=x2(x+y)-(x+y)2
=(x+y)[x2-(x+y)]
x3+（y-1）x2-2xy-y2
=x3+yx2-x2-2xy-y2
=x2(x+y)-(x+y)2
=(x+y)(x-y)