计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)

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计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)

计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)
计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)

计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)
y/(x²-xy)+2/(y-x)-x/(y²-xy)
=[y²+2(-xy)+x²]/(x²y-xy²)
=(x-y)²/[(x-y)xy]
=(x-y)/(xy)

=y/x(x-y)-2/(x-y)+x/y(x-y)
=(y²-2xy+x²)/xy(x-y)
=(x-y)²/xy(x-y)
=(x-y)/xy