[-(xy)/(x-y)²]^4*(y²-xy/x)³*x^4/y^10÷(x/xy-y²)^5,y=-1就是(y²-xy)³(xy-y²)^5/(x-y)^8*y^6,就是y³,y=-1
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[-(xy)/(x-y)²]^4*(y²-xy/x)³*x^4/y^10÷(x/xy-y²)^5,y=-1就是(y²-xy)³(xy-y²)^5/(x-y)^8*y^6,就是y³,y=-1
[-(xy)/(x-y)²]^4*(y²-xy/x)³*x^4/y^10÷(x/xy-y²)^5,y=-1
就是(y²-xy)³(xy-y²)^5/(x-y)^8*y^6,就是y³,y=-1
[-(xy)/(x-y)²]^4*(y²-xy/x)³*x^4/y^10÷(x/xy-y²)^5,y=-1就是(y²-xy)³(xy-y²)^5/(x-y)^8*y^6,就是y³,y=-1
(-1)³,原式=-1