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1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=
人气：354 ℃　时间：2020-04-13 12:33:13
解答
(6X+4Y)/(36X2-16Y2)-(6X-4Y)/(36X2-16Y2)=2Y/(9X2-4Y2)
再+3X/(4Y^2-9X^2)
=(2Y-3X)/(4Y^2-9X^2)=2Y+3X
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