如何解xy(x-y)-x(x-y)^2

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如何解xy(x-y)-x(x-y)^2

如何解xy(x-y)-x(x-y)^2
如何解xy(x-y)-x(x-y)^2

如何解xy(x-y)-x(x-y)^2
xy(x-y)-x(x-y)²
=x(x-y)[y-(x-y)]
=x(x-y)(2y-x)
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解xy(x-y)-x(x-y)^2
=x(x-y)[y-(x-y)]
=x(x-y)(2y-x)

提取(x-y)(xy-x(x-y))然后算出后面的(x-y)(xy-x²+xy)等于(x-y)(2xy-x²)等于2x²y-x^3-2xy²+x²y