作者Edward56 (锋)
看板trans_math
标题[微分] 2题
时间Tue Jan 1 17:52:30 2013
1.
A moving company wishes to design an open-top box
with a square base whose volume is exactly 32 cubic feet.
Please find the dimensions of the box requiring
the least amount of materials.[逢甲]
2.
Economists estimate that the relationship between the tax rate t
on an item and the total sales S of that item(in millions of dollars)
is
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S(t)=9-20 / t for 0<=t<=0.2
Please find the tax rate that maximizes revenue to the government.[课本]
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◆ From: 118.168.163.171
※ 编辑: Edward56 来自: 118.168.163.171 (01/01 18:04)
1F：推 beansop:第一题假设未知数然後用拉格朗日法求最大 115.43.222.95 01/01 22:55
2F：推 craig100:第二题 微分求critical point 记得注意 140.112.25.108 01/02 01:38
3F：→ craig100:critical point是否在范围内 140.112.25.108 01/02 01:39
4F：→ craig100:如果不在范围内 那就考虑范围的端值吧 140.112.25.108 01/02 01:39