作者dreamenjoy (今天也很爽)
看板trans_math
标题[考古] 99师大考古
时间Thu May 26 00:33:00 2011
99师大考古
1.
S is the region formed by x=y,x+y-3=0 and x=0.please find the
double integral of ∫∫(2x+2y-1)dxdy
2.
The weekly cost to produce x widgets is given by
C(x)=75000+100x-0.03x^2+0.000004x^3,
0<=x<=10000 and the demand function for the widgets is given by
p(x)=200-0.005x,0<=x<=10000 Assume that the company sells exascly what
they protuce.
(a)What are the marginal cost,marginal revenue and marginal profit when 2500
widgets are sold?
(b)What are the marginal cost,marginal revenue and marginal profit when 7500
widgets are sold?
我承认我英文很差看不懂题目。
北大考古
3.
设某工厂生产某产品之固定成本为200,000元，每一产品之变动成本为400元，
制成後售出之价格每件为500元，求
(a)产品的成本函数
(b)产品的收入函数
(c)利润函数
(d)扯平点
4.
使用Lagrange求点(1.2.4)至平面2x-3y+z=4之最短距离
5.
1
∫arctan xdx
0
这题我也看不懂XD
题目有点多麻烦各位高手了，先说声感恩不尽。
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◆ From: 122.118.8.163
1F：→ a016258:5.有什麽好看不懂@@? 分部积分~~ 114.44.184.240 05/26 07:13
2F：→ dreamenjoy:arc 我看无 是单纯积分的意思吗?? 122.118.3.236 05/26 09:59
3F：推 a016258:arctan 是一个函数~ 114.44.184.240 05/26 10:11