推 werul:T=n(x1+x2+x3)=m(x2+x3)=>T/x1=n/(m-n)(x2+x3) 09/02 03:16
推 werul:上面算式好像錯了 不要裡我 09/02 03:19
推 teves:1/(1/n-1/m) = nm/(m-n) 09/02 09:01
推 BGirlAlu:mn/(m-n) 09/02 12:07
x1，x2，x3合力做一工程需花n個小時，x2和x3合力做此工程要花m個小時，若rate不變，
問x1單獨做需多久時間
請問這一題該怎麼算?
--
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!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 219.84.0.216