作者windhsu (小太极)
看板Inference
标题[问题] 一个数学问题
时间Wed Sep 2 02:28:05 2009
x1，x2，x3合力做一工程需花n个小时，x2和x3合力做此工程要花m个小时，若rate不变，
问x1单独做需多久时间
请问这一题该怎麽算?
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In fearful day, in raging night,
With strong hearts full, our souls ignite,
When all seems lost in the War of Light,
Look to the stars-- For hope burns bright!
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 219.84.0.216
1F：推 werul:T=n(x1+x2+x3)=m(x2+x3)=>T/x1=n/(m-n)(x2+x3) 09/02 03:16
2F：推 werul:上面算式好像错了 不要里我 09/02 03:19
3F：推 teves:1/(1/n-1/m) = nm/(m-n) 09/02 09:01
4F：推 BGirlAlu:mn/(m-n) 09/02 12:07