[考研类试卷]考研数学三(微积分)模拟试卷125(无答案).doc

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1、考研数学三(微积分)模拟试卷 125(无答案)一、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。1 已知 一 ax 一 b)=0,其中 a,b 是常数,则(A)a=1 ,b=1(B) a=一 1,b=1(C) a=1,b=一 1(D)a= 一 1,b=一 11 设有定义在(一,+)上的函数:则2 其中在定义域上连续的函数是_;3 ()以 x=0 为第二类间断点的函数是 _二、填空题4 极限 =_三、解答题解答应写出文字说明、证明过程或演算步骤。5 求下列极限:6 求下列极限:7 设 f(x)在0,+)连续,且满足 8 设 f(x)可导,且 f(0)=0,f(0)0 ,求 w= 9

2、已知 w= =1,求常数 a0 与 b 的值10 确定常数 a,b,c 的值,使 =411 设( )f(x)= ;求 f(x),g(x)12 13 求 w= 14 求下列数列极限:15 当 x0 时下列无穷小是 x 的 n 阶无穷小,求阶数 n:() 一 1; ()(1+tan2x)sinx 一 1;() ; () 0xsintsin(1 一 cost)2dt16 设函数 f(x)存 x=0 的某邻域内具有一阶连续导数,且 f(0)0,f(0)0 ,若 af(h)+bf(2h)一 f(0)当 h0 时是比 h 高阶的无穷小,试确定 a、b 的值17 试确定 a 和 b 的值,使 f(x)= 有无穷间断点 x=0,有可去间断点x=118 设 f(x)= 试确定常数 a,使 f(x)在 x=0 处右连续19 设 f(x)是在(一,+)上连续且以 T 为周期的周期函数,求证:方程 f(x)一的闭区间上至少有一个实根20 设 f(x)在( 一,+)连续,存在极限 f(x)=B证明:()设 AB,则对 (一,+),使得 f()=;()f(x)在(一,+)上有界

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