【考研类试卷】考研数学二(函数、极限、连续)-试卷7及答案解析.doc

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1、考研数学二(函数、极限、连续)-试卷 7 及答案解析(总分:72.00,做题时间:90 分钟)一、选择题(总题数:4,分数:8.00)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.下列为奇函数的是( ) (分数:2.00)A.B.C.D.3.设当 x0 时,e x -(ax 2 +bx+1)是 x 2 的高阶无穷小,则( )(分数:2.00)A.B.a=1,b=1C.D.a=-1,b=14.设 = (分数:2.00)A.低阶无穷小B.高阶无穷小C.等价无穷小D.同阶但非等价的无穷小二、填空题(总题数:8,分数:16.00)5.设 f(x)= (分数:2.

2、00)填空项 1:_6.设 a0,b0 都是常数,则 (分数:2.00)填空项 1:_7.若 x0 时, (分数:2.00)填空项 1:_8.当 x0 时,3x-4sinx+sinxcosx 与 x n 为同阶无穷小,则 n= 1(分数:2.00)填空项 1:_9.若当 x (分数:2.00)填空项 1:_填空项 1:_10.设 x0 时,lncosax-2x b (a0),则 a= 1,b= 2(分数:2.00)填空项 1:_填空项 1:_11.,则 a= 1 (分数:2.00)填空项 1:_12.若 (分数:2.00)填空项 1:_三、解答题(总题数:24,分数:48.00)13.解答题解

3、答应写出文字说明、证明过程或演算步骤。(分数:2.00)_14.设 f(x)= (分数:2.00)_15.设 f(x)=2lnx,f(x)3=ln(1-lnx),求 (x)及其定义域(分数:2.00)_16.设 f(x)= (分数:2.00)_17.设 f(x)连续可导,f(0)=0,f“(0)0,F(x)= (分数:2.00)_18.求 (分数:2.00)_19.求极限 (分数:2.00)_20.求 (分数:2.00)_21.求 (分数:2.00)_22.求极限 (分数:2.00)_23.求极限 (分数:2.00)_24.求 (分数:2.00)_25.求 (分数:2.00)_26.求极限 (

4、分数:2.00)_27.设 a0,b0,求 (分数:2.00)_28.求 (分数:2.00)_29.求 (分数:2.00)_30.求 (分数:2.00)_31.求 (分数:2.00)_32.求 (分数:2.00)_33.求 (分数:2.00)_34.求 (分数:2.00)_35.求 (分数:2.00)_36.求极限 (分数:2.00)_考研数学二(函数、极限、连续)-试卷 7 答案解析(总分:72.00,做题时间:90 分钟)一、选择题(总题数:4,分数:8.00)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)_解析:2.下列为奇函数的是( ) (分数:2.0

5、0)A.B.C.D. 解析:解析:因为 h(-x)=-h(x),所以 h(x)为奇函数,应选(D)3.设当 x0 时,e x -(ax 2 +bx+1)是 x 2 的高阶无穷小,则( )(分数:2.00)A. B.a=1,b=1C.D.a=-1,b=1解析:解析:由 由已知条件得 a=4.设 = (分数:2.00)A.低阶无穷小B.高阶无穷小C.等价无穷小D.同阶但非等价的无穷小 解析:解析:由二、填空题(总题数:8,分数:16.00)5.设 f(x)= (分数:2.00)填空项 1:_ (正确答案:正确答案:*)解析:解析:因为 f(x)0,所以 ff(x)=6.设 a0,b0 都是常数,则

6、 (分数:2.00)填空项 1:_ (正确答案:正确答案:*)解析:解析:7.若 x0 时, (分数:2.00)填空项 1:_ (正确答案:正确答案:-4)解析:解析:由8.当 x0 时,3x-4sinx+sinxcosx 与 x n 为同阶无穷小,则 n= 1(分数:2.00)填空项 1:_ (正确答案:正确答案:5)解析:解析:方法一9.若当 x (分数:2.00)填空项 1:_ (正确答案:正确答案:*)填空项 1:_ (正确答案:1)解析:解析:由10.设 x0 时,lncosax-2x b (a0),则 a= 1,b= 2(分数:2.00)填空项 1:_ (正确答案:正确答案:2)填

7、空项 1:_ (正确答案:2)解析:解析:lncosax=ln1+(cosax-1)cosax-111.,则 a= 1 (分数:2.00)填空项 1:_ (正确答案:正确答案:ln3)解析:解析:由 12.若 (分数:2.00)填空项 1:_ (正确答案:正确答案:-4)解析:解析:由三、解答题(总题数:24,分数:48.00)13.解答题解答应写出文字说明、证明过程或演算步骤。(分数:2.00)_解析:14.设 f(x)= (分数:2.00)_正确答案:(正确答案:由 f(x)= =1-x 得 2 (x)=ln(1-x),故 (x)= )解析:15.设 f(x)=2lnx,f(x)3=ln(

8、1-lnx),求 (x)及其定义域(分数:2.00)_正确答案:(正确答案:由于 f(x)=2ln(x)=ln(1-lnx)得 2 (x)=1-lnx,解得 (x)= )解析:16.设 f(x)= (分数:2.00)_正确答案:(正确答案:fg(x)= g(x)1 等价于 ,解得 x1; g(x)1 等价于 ,解得x1, 则 fg(x)= )解析:17.设 f(x)连续可导,f(0)=0,f“(0)0,F(x)= (分数:2.00)_正确答案:(正确答案: )解析:18.求 (分数:2.00)_正确答案:(正确答案: )解析:19.求极限 (分数:2.00)_正确答案:(正确答案: )解析:2

9、0.求 (分数:2.00)_正确答案:(正确答案: )解析:21.求 (分数:2.00)_正确答案:(正确答案: )解析:22.求极限 (分数:2.00)_正确答案:(正确答案: )解析:23.求极限 (分数:2.00)_正确答案:(正确答案: )解析:24.求 (分数:2.00)_正确答案:(正确答案:由 ln(1+x)= 得 ln(1-2x)=-2x-2x 2 +o(x 2 ), 于是 arctan 2 x2x+ln(1-Zx)-2x 4 ; )解析:25.求 (分数:2.00)_正确答案:(正确答案:ln(1-x)ln(1-x)-ln(1-x 2 )=ln(1+x)ln(1-x)-ln(

10、1+x)(1-x) =ln(1+x)ln(1-x)-1-ln(1-x), 由 ln(1+x)= ln(1-x)= 得 ln(1+x)-ln(1-x)-1 ln(1+x)ln(1-x)-1-In(1-x) )解析:26.求极限 (分数:2.00)_正确答案:(正确答案: )解析:27.设 a0,b0,求 (分数:2.00)_正确答案:(正确答案: )解析:解析:28.求 (分数:2.00)_正确答案:(正确答案: )解析:29.求 (分数:2.00)_正确答案:(正确答案: )解析:30.求 (分数:2.00)_正确答案:(正确答案: )解析:31.求 (分数:2.00)_正确答案:(正确答案: )解析:32.求 (分数:2.00)_正确答案:(正确答案: )解析:33.求 (分数:2.00)_正确答案:(正确答案: )解析:34.求 (分数:2.00)_正确答案:(正确答案:由 )解析:35.求 (分数:2.00)_正确答案:(正确答案: )解析:36.求极限 (分数:2.00)_正确答案:(正确答案: )解析:

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