若xy/(x+y)=3,则(6x+4xy+6y)/(9x+4xy+9y)=______
人气：272 ℃ 时间：2020-05-23 15:09:56
解答
XY/（X+Y）=3,XY=3（X+Y）
原式=［6（X+Y）+4XY］/［9（X+Y）+4XY］
=［6（X+Y）+12（X+Y）］/［9（X+Y）+12（X+Y）］
=［18（X+Y）］/［21（X+Y）］
=18/21
=6/7
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