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计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)
人气:139 ℃ 时间:2020-01-28 15:53:16
解答
y/(x²-xy)+2/(y-x)-x/(y²-xy)
=[y²+2(-xy)+x²]/(x²y-xy²)
=(x-y)²/[(x-y)xy]
=(x-y)/(xy)
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