x/xy-y²与y/x²-xy 通分

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x/xy-y²与y/x²-xy 通分

x/(xy-y²)=x/[y(x-y)]
y/(x²-xy)=y/[x(x-y)]
∴公分母为：xy(x-y)
通分后得
x/(xy-y²)=x²/[xy(x-y)]
y/(x²-xy)=y²/[xy(x-y)]
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