作者yhliu (老怪物)
看板trans_math
标题Re: [微分] 一题极限应用题
时间Fri Mar 30 08:23:42 2007
※ 引述《ahongyeh (小叶子)》之铭言：
: A company is increasing production of an item at the rate of 50 units per
: day. All units produced can be sold. The daily demand function is given
: by p=50-(x/200) where x is the number of units produced (and sold) and p
: is price in dollars. Find the rate of change of revenue with respect to
: time (in days) when the daily production is 200 units.
: 题目看得懂，但是不知道怎麽求...麻烦高手了...
: 答案是 2400
若你真的看懂了, 怎会 "不知道怎麽求"?
dx/dt = 50
x=200
p=50-(x/200)
R=xp
问: dR/dt.
只是 related rate 的基本练习.
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