[微積] 一題成本問題
If the operating costs of a delivery truck are 16+(x/2) cents per mile
when the truck travels x mi/hr and the driver earns $10 per hour,
what is the most economical speed, to the nearest integer, to operate
the truck on a 200-mile-long road, where the minimum speed is 50 mi/hr
and the maximum speed is 75 mi/hr ? (A)50 (B)56 (C)63 (D)75
我的算式是 10．(200/x) - 200．[16+(x/2)]．(1/100)，50<=x<=75
然後再去算極值 但好像怪怪的 找不出答案 不曉得算式是否有問題
先謝謝熱心回答的版友
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 220.143.73.179 (臺灣)
※ 文章網址: https://www.ptt.cc/bbs/Math/M.1645717334.A.44B.html
推
02/25 11:58,
3年前
, 1F
02/25 11:58, 1F