【考研类试卷】考研数学一(高等数学)模拟试卷250(无答案).doc

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1、考研数学一(高等数学)模拟试卷 250 及答案解析(总分:60.00,做题时间:90 分钟)一、选择题(总题数:6,分数:12.00)1.选择题下列每题给出的四个选项中,只有一个选项符合题目要求。(分数:2.00)_2.中,无穷大量是 (分数:2.00)A.B.C.D.3.设 f(x)= (分数:2.00)A.f(x)在 x=0 处不连续B.f(0)存在C.f(0)不,曲线 y=f(x)在点(0,0)处不切线D.f(0)不,曲线 y=f(x)在点(0,0)处有切线4.下列反常积分中发散的是 (分数:2.00)A.B.C.D.5.设 z=f(x,y)= (分数:2.00)A.可微B.偏导数存在,

2、但不可微C.连续,但偏导数不存在D.偏导数存在,但不连续6.设有级数 a n ,S n = a n ,则 S n 有界是级数 (分数:2.00)A.充分条件B.必要条件C.充分必要条件D.既非充分条件也非必要条件二、填空题(总题数:4,分数:8.00)7.设 f(x)有任意阶导数且 f(x)=f 3 (x),则 f (n) (x)= 1(分数:2.00)填空项 1:_8.设 y=f(x)满足y= (分数:2.00)填空项 1:_9.微分方程 y“+6y+9y=0 的通解 y= 1(分数:2.00)填空项 1:_10.设 L 是乒方形边界:|x|+|y|=a(a,0),则 I= L xyds=

3、1,J= L |x|ds= 2(分数:2.00)填空项 1:_三、解答题(总题数:17,分数:40.00)11.解答题解答应写出文字说明、证明过程或演算步骤。_12.设 0x 0 1,x n+1 =x n (2x n ),求证:x n 收敛并求 (分数:2.00)_13.证明: (分数:2.00)_设 (分数:4.00)(1).当 xa 时无穷小 f(x)与 g(x)可比较,不等价( (分数:2.00)_(2).当 0“|xa| 时 f(x)与 f * (x)均为正值,求证: (分数:2.00)_14.设函数 f(x)在(,+)内满足 f(x)=f(x)+sinx,且 f(x)=x,x0,),

4、求 3 f(x)dx(分数:2.00)_15.设 f(x)在a,b有连续的导数,求证: (分数:2.00)_16.设 f(x),g(x)在(a,b)内可导,g(x)0 且 =0( (分数:2.00)_17.证明方程 x=asinx+b(a0,b0 为常数)至少有一个正根不超过 a+b(分数:2.00)_18.()设 f(x)在x 0 ,x 0 +)(x 0 ,x 0 )连续,在(x 0 ,x 0 +)(x 0 ,x 0 )可导,又 f(x)=A( f(x)=A),求证:f + (x 0 )=A(f (x 0 )=A) ()设 f(x)在(x 0 ,x 0 +)连续,在(x 0 ,x 0 +)x

5、 0 可导,又 (分数:2.00)_19.设 f(x)在(0,+)二阶可导且 f(x),f“(x)在(0,+)上有界,求证:f(戈)在(0,+)上有界(分数:2.00)_20.在0,+)上给定曲线 y=y(x)0,y(0)=2,y(x)有连续导数已知 (分数:2.00)_21.设 z=f(x,y)满足 =2x,f(x,1)=0, (分数:2.00)_设 f(x,y)=2(yx 2 ) 2 (分数:4.00)(1).求 f(x,y)的驻点;(分数:2.00)_(2).求 f(x,y)的全部极值点,并指明是极大值点还是极小值点(分数:2.00)_22.设函数 f(u,v)具有二阶连续偏导数,函数 g(y)连续可导,且 g(y)在 y=1 处取得极值 g(1)=2求复合函数 z=f(xg(y),x+y)的二阶混合偏导数 (分数:2.00)_23.设质点 P 沿以 为直径的下半圆周,从点 A(1,2)运动到 B(3,4)的过程中,受变力 F 的作用,F的大小等于点 P 到原点 O 之距离,方向垂直于线段 (分数:2.00)_求下列曲面积分(分数:6.00)(1).I= (分数:2.00)_(2).I= (分数:2.00)_(3).I= (x 2 y 2 )dydz+(y 2 z 2 )dzdx+(z 2 x 2 )dxdy,S 是 (分数:2.00)_24. (分数:2.00)_

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