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通分x+y/x平方-y平方,2xy/x平方-xy
人气:240 ℃ 时间:2020-03-22 15:07:22
解答
(x+y)/(x²-y²)=(x+y)/(x+y)(x-y)=1/(x-y)
2xy/(x²-xy)=2xy/x(x-y)=2y/(x-y)
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