(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y

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(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x

(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y

(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(xy-x²)÷xy分之x²-2xy+y²乘x²分之x-y
=-x(x-y)×xy/(x-y)² ×(x-y)/x²
=-y
∴结果与x的值没有关系
正确的结果是
原式=-y=5

原式=-x(x-y)× xy/(x-y)平方 ×(x-y)/x²
=-y