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※ [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?﹞ (d) Give a short explanation of why the following approximation is valid. ____ √4.02 ≒ 2 + 1/4(0.02) 這啥? 2.Show that the function g(x)= x∣x∣has an inflection point at (0,0), but g"(0) does not exist. 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. ...... 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... 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 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 219.86.33.91 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.240.101
Thitta:祝大家順利...= = 11/11 20:15
※ 編輯: Thitta 來自: 140.112.240.101 (11/11 20:32) ※ 編輯: Thitta 來自: 140.112.240.101 (11/11 20:33)
christless:這不推還是人嗎???旭峰乾爹~ 11/11 20:38
※ 編輯: Thitta 來自: 140.112.240.101 (11/11 21:36) ※ 編輯: Thitta 來自: 140.112.240.101 (11/11 22:19)
littlecutie:推一個好了 11/11 23:09
※ 編輯: Thitta 來自: 140.112.240.101 (11/12 00:03)
troysky:大推~ 11/12 10:03
nickivan:(d)Let f(x)=x^(1/2),since f(x+dx)=f(x)+f'(x+dx)+..... 11/12 13:26
nickivan:hence (4.02)^(1/2)=f(4+0.02)=f(x=4)+f'(x=4)(0.02)+... 11/12 13:30
nickivan:=4^(1/2)+1/2(4)^(-1/2)(0.02)+.....~2+1/4(0.02) 得證 11/12 13:33
nickivan:(c)答案不是 1吧?畫圖可以看出來喔~a有兩個值 11/12 13:47
littlecutie:來偷寫一下好了 11/12 21:52
littlecutie:感覺助教頗威 11/12 21:52
Thitta:還沒細看,先推一個好了,感謝~~~ 11/12 21:58
littlecutie:決定先看電視!!! 11/12 22:02
Thitta:突然發現x^2好像是X平方的意思,我一直以為是乘號 11/12 22:15
※ 編輯: Thitta 來自: 140.112.240.101 (11/12 22:21)