(xy-x^2)除以xy分之x-y
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(xy-x^2)除以xy分之x-y(xy-x^2)除以xy分之x-y(xy-x^2)除以xy分之x-y(xy-x^2)除以xy分之x-y=x(x-y)×xy/(x-y)=x²y原式=-x(x
(xy-x^2)除以xy分之x-y
(xy-x^2)除以xy分之x-y
(xy-x^2)除以xy分之x-y
(xy-x^2)除以xy分之x-y
=x(x-y)×xy/(x-y)
=x²y
原式=-x(x-y)乘xy/(x-y)
=-x²y
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