(xy-x²)·x²分之x-y

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(xy-x²)·x²分之x-y(xy-x²)·x²分之x-y(xy-x²)·x²分之x-y(xy-x²)·x²分之x-y

(xy-x²)·x²分之x-y
(xy-x²)·x²分之x-y

(xy-x²)·x²分之x-y
(xy-x²)·x²分之x-y
=(x-y)/x^2*x(y-x)
=-1/x^3

(x-y)/x(y-x)*x²=-1/x^3