x-y/xy-y^2计算

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x-y/xy-y^2计算x-y/xy-y^2计算x-y/xy-y^2计算解(x-y)/(xy-y²)=(x-y)/y(x-y)=1/y

x-y/xy-y^2计算
x-y/xy-y^2计算

x-y/xy-y^2计算

(x-y)/(xy-y²)
=(x-y)/y(x-y)
=1/y