计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
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计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3