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)^2xy(x-y)-x(x-y)²=x(x-y)[y-(x-y)]=x(x-y)
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
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