作者a50525004 (雾丸)
看板trans_math
标题边际成本的问题
时间Wed May 18 10:35:05 2011
The marginl cost of manufacturing x yards of a certain fabric is
MC=3-0.01x+0.000006x^2 (in dollars per yard). Find the increase in cost if the
production level is raised from 2000 yardsto 4000yards.
4000
这题我用S MC dQ算为何会错呢
2000
解答是MCΔX=C(X+Δ)-C(X)
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