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当x/y=2/3时,4x+3y/3x-5y=_______
人气:325 ℃ 时间:2019-12-18 07:08:56
解答
设x=2t,y=3t,t≠0,则
(4x+3y)/(3x-5y)
=(4*2t+3*3t)/(3*2t-5*3t)
=17t/(-9t)
=-17/9
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