计算x/(x-y)-x/y
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原式
=xy/[y(x-y)]-x(x-y)/[y(x-y)]
=[xy-x(x-y)]/[y(x-y)]
=(xy-x²+xy)/[y(x-y)]
=(2xy-x²)/[y(x-y)]
=[x(2y-x)]/[y(x-y)]
=xy/[y(x-y)]-x(x-y)/[y(x-y)]
=[xy-x(x-y)]/[y(x-y)]
=(xy-x²+xy)/[y(x-y)]
=(2xy-x²)/[y(x-y)]
=[x(2y-x)]/[y(x-y)]
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x/(x-y)-x/y
=xy/[y(x-y)]-x(x-y)/[y(x-y)]
=[xy-x(x-y)]/[y(x-y)]
=(xy-x²+xy)/[y(x-y)]
=(2xy-x²)/[y(x-y)]
=[x(2y-x)]/[y(x-y)]
=xy/[y(x-y)]-x(x-y)/[y(x-y)]
=[xy-x(x-y)]/[y(x-y)]
=(xy-x²+xy)/[y(x-y)]
=(2xy-x²)/[y(x-y)]
=[x(2y-x)]/[y(x-y)]
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xy/(x-y)-x/y
=xy/(xy-y^2)-(x^2-xy)/(xy-y^2)
=xy-(x^2-xy)
=xy-x^2+xy
=2xy-x^2
=xy/(xy-y^2)-(x^2-xy)/(xy-y^2)
=xy-(x^2-xy)
=xy-x^2+xy
=2xy-x^2
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