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微積分

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國立台中教育大學 95 學年度大學日間部轉學招生考試

微積分 試題

適用學系:數教系

一、 選擇題:

(10 題,每題 4 分,共 40 分。)

1.設    < + ≥ + = 2 4 2 2 2 2 3 x bx ax x ax x x f , , ) ( 對所有x值皆可微分,則(a,b)=? (A)( 12, ) (B)( ,3) 2 3 (C)( , 8) 3 8 − (D)(3,− 。 5) 2.若二次函數 f(x)=2ax2 −bx+4c滿足 f(2)= f(2)=0且 f(1)=1,則 f′ )(4 = ? (A)1 (B) 1− (C) 4− (D) 4 。 3.設 f(x)= x3 +3x2 −9x−10在區間 ( 4, 2)− 的相對極大值為m,相對極小值為n,則 = − n m (A)16 (B)32 (C)40 (D)56 。 4.求定積分

dx= x x x 4 1 2 3 4 ? (A) 8 39 (B) 8 9 − (C)7 3 (D) 8 15 。 5.由曲線 x e y= 與三直線x=0、x=9、y=0所圍成之區域繞x軸旋轉一周所得之立 體體積為 (A)π e( 9 −1) (B) 27 e π (C) ( 1) 2 18 π e (D) ( 1) 2 9 π e 6.級數:(a)

∞ =1 ! 1 i i (b)

∞ =1 1 i i (c)

∞ =1 2 1 i i (d)

∞ =1 2 1 i i 請問級數中收斂的有幾個(A)1 (B)2 (C)3 (D)4。 7.計算級數

∞ =1 ! 1 i i 的近似值:(A)1.7 (B)2.7 (C)3.1 (D)∞ 。 8.計算級數 dx x x

0∞ sin 的近似值:(A)1.6 (B)2.7 (C)3.1 (D) ∞ 。 9.計算級數

∞ = + 1 1) (i (-1) i i 的近似值:(A)0.7 (B)1.7 (C)2.1 (D)∞ 。 10.已知(a)

∞ =1 i ! i i i (b)

∞ =1 i ! 2 i i (c)

∞ =1 2 +7 −1 1 i i i (d) dx x x

0∞ sin 判斷上列之值,其值有限的有幾個(A)1 (B)2 (C)3 (D)4。

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二、 計算及證明題:(6 題,每題 10 分,共 60 分。)

1. = + − → ln(1 )) 1 1 ( lim 0 x x x ? 2.求

x2e3x3+1dx=? 3.請利用微積分的概念證明「在周長為 S 的所有矩形中,邊長為 S/4 的正方形面積最 大」。 4.請利用微積分的概念導出「高為 h 且底是邊長為 a 的正方形之正角錐的體積公式」。

5.One set of parametric equations for an ellipse is

( ) sin( )

x= f t =a t , ( )y=g t =bcos( )t

where 0< <a b (so the ellipse is stretched in the y-direction). Find the curvature as a function of t and show that the curvature is largest at the narrow end of the ellipse where the curve crosses the y-axis.

6.Show that any function of the form

( ) ( )

z= f x+at +g x at

is a solution of the wave equation

2 2 2 2 2 z z a t x= ∂ ∂ ∂

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