作者LuisSantos ( )
看板trans_math
标题Re: [考古] 高大96
时间Tue Jul 1 10:34:58 2008
※ 引述《shallow1112 (小扯)》之铭言:
: 不好意思
: 有10题
: 麻烦大家了
: 谢谢
: 1.A Deposit $P made into a fund with an annual interest rate of r
: . Fund the time (in years) necessary to double if the interest is
: compounded continuously.
: 2.determine the convergence or divergence for the following series:
: ∞ n! ∞ n!
: (a)Σ --- (b)Σ ---
: n=1 n^n n=1 10^n
: 3.For what values of η (demand elasticity of price, η>0) is the
: demand function p=37x^(-1/η) elastic, where p is the price of x?
: x-4
: 4.Find all intervals of x on which y=------- is concave down.
: x+4
: dy siny
: 5.Find ---- for y^3+------=㏑√cosx +4x
: dx e^y
: 6.Find the area of the region bounded by the graphs of y=x^2 and y=2-x^2.
: 7.Find the integral ∫e^3xsin4xdx.
: 8.Please use (a) Trapezoidal rule, and (b) Simpson rule both with n=4 to
: 3
: approximate ∫ (x+2)^3 dx.
: 1
(a)梯形法
b - a
将区间[a,b] n 等分, 一等分 ----- , n为正整数 , (n≧2)
n
b
∫ f(x) dx
a
b-a
≒ (---)(f(a) + f(b) + 2(f(x_1) + f(x_2) + ... + f(x_(n-1)))
2n
i(b - a)
其中 x_i = a + -------- , i = 1 , 2 , ... , n
n
n = 4 , f(x) = (x + 2)^3 , a = 1 , b = 3
1*(3-1)
x_1 = 1 + ------- = 1.5
4
2*(3-1)
x_2 = 1 + ------- = 2
4
3*(3-1)
x_3 = 1 + ------- = 2.5
4
b-a 3-1 3
---- = ----- = ---
2n 2*4 8
3
∫ (x+2)^3 dx
1
3
≒ (---)(f(1) + f(3) + (2)(f(1.5) + f(2) + f(2.5)))
8
3
= (---)(3^3 + 5^3 + (2)((3.5)^3 + 4^3 + (4.5)^3)) = 205.5
8
: 9.Find the Maclaurin sreies representation for f(x)=e^(-x^2) , then
: (49)
: find f (0).
: 10.John拟於下月1日向某车商购置一辆新车,车商现在有两种优惠方案,一为现金价;
: 按原定价P元折抵X元(X<P),一次付清;二为五年低利(年利率r)分期付款;依定价P元计
: 算,每月底还款Y元,试问John应如何比较此两方案以节省荷包(假设五年内市场年利率
: 维持固定为i,且i>r)?
: 想请问一下
: 我有看到麦克劳林级数
: 请问这是会考的重点吗???
: 还有大约考哪些重点呢?
: 我快吓死了啦!我的天阿
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◆ From: 61.66.173.21
※ 编辑: LuisSantos 来自: 61.66.173.21 (07/01 10:52)
※ 编辑: LuisSantos 来自: 61.66.173.21 (07/01 11:08)