作者jk123456 (拿铁红茶)
看板trans_math
标题[微分] 奇怪的题目...
时间Fri Nov 9 01:16:34 2007
C(X)=1/3X*X+4X+53
X(t)=0.2t*t+0.03t
At what rate is cost changing with respect to time after 4 hours
and production level t hours into a particular run is X(T)=
差不多是这样
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