[-xy/(x-y)²]²×(y²-xy/x)³

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[-xy/(x-y)²]²×(y²-xy/x)³[-xy/(x-y)²]²×(y²-xy/x)³[-xy/(x-y)&#

[-xy/(x-y)²]²×(y²-xy/x)³
[-xy/(x-y)²]²×(y²-xy/x)³

[-xy/(x-y)²]²×(y²-xy/x)³
原式=x²y²/(x-y)^4×[-y³(x-y)³]/x³
=-y^5/[x(x-y)]
=-y^5/(x²-xy)