Re: [轉錄][考古題] 94上 張秀瑜 微積分乙 期中
※ 引述《Thitta (胖胖 )》之銘言:
: ※ [本文轉錄自 NTU-Exam 看板]
: 作者: diep (隱藏人物) 看板: NTU-Exam
: 標題: [試題] 94上 張秀瑜 微積分乙 期中
: 時間: Sun Nov 13 16:11:17 2005
: 課程名稱︰微積分乙上
: 課程性質︰共同必修
: 課程教師︰張秀瑜
: 開課系所︰管院、地理、經濟
: 考試時間︰94/11/10
: 試題 :
: 1. ___
: (a) Find lim√x+1 -2/(x-3).
: x→3
: 應該是1/4
: (b) Prove that lim x^2cos(1/x^2) = 0.
: x→0
: 用夾擊定理,課本88頁
: (c) Find all values of a such that f is continuous on R, where
: { x^2, if x > a;
: f(x) = {
: { x+1, if x≦ a.
: 2
: 作x =x+1﹝是這樣嗎?﹞
應該是這樣。
: (d) Give a short explanation of why the following approximation is valid.
: ____
: √4.02 ≒ 2 + 1/4(0.02)
: 這啥?
3.10 LINEAR APPROXIMATION
我試著寫一下〈寫的好爛> <|||〉
Let f(x)=√x,so the linear approximation of x at 2 is f(2)+f`(2)(x-2)
therefore, √4.02 ≒ 2 + 1/4(0.02)
意思有到就好...
: 2.Show that the function g(x)= x∣x∣has an inflection point at (0,0), but
: g"(0) does not exist.
坦白說這題我不會耶!後天問好了!這題在p249第61題。
: dy 3 _
: 3.Find —. (a) y = 2csc (√x) (b) tan(x/y) = x+y
: dx
: chain rule 答案好長...不會打...= =
: 4.If y = f(u) and u = g(x), where f and g are third differentiable function,
: d^2y d^2y (du)2 dy d^2u d^3y
: — = — (-) + — — . Find a formula for — similar to
: dx^2 du^2 (dx) du dx^2 dx^3
: the one given above.
: 這題是課本197頁的第65題,老師最近一次上課有講過,有背有保佑
: 5.Prove that if a > 0 and n is any positive integer, then the polynomial
: function
: 2n+1
: p(x) = x + ax + b
: cannot have two real roots.
: ......
利用MVT,使用反證法。
: 6.Find an equation of the line through the point (3,5) that cuts the least
: area from the first quadrant.
: 有人會這題嗎...
這應該是英文問題吧...quadrant是象限。
再超級現醜一下好了。
Let the equation of this line be 3/a+5/b=1. a is the interception of this
line to x-axis. b is the interception of this line to y-axis.
We would like to know the minimum of 1/2*ab
By 算幾不等式〈我真的掰不下去了....〉, (3/a+5/b)/2 >= √15/ab
→1/2 >= √15/ab → 1/2 ab >= 30,so the minimum is 30
基本上這題我用算幾作,因為不想動微積分的腦袋= =
所以會用微積分解的教一下吧!
: 7.Sketch the graph of y = x^3 -1/x^3 + 1
: 事實證明,真的會考畫圖題,詳情請見第四章
我討厭作圖= =。
祝大家期中考順利!上課一直發問絕對沒關係!她不會怎樣的。
她是個好媽媽^^
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