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2007年考研数二真题解析(刷题版)

2007年考研数二真题解析(刷题版)

更详细和多方法的解析可以在公众号回复“真题解析”获取。

1
一、选择题

(1)

当  时,与  等价的无穷小量是( )

A. 
 B. 
 C. 
 D. 

答案: B

解析: 当  时,。又 ,故选 B。


(2)

函数  在  上的第一类间断点是 ( )

A. 
 B. 
 C. 
 D. 

答案: A

解析: 函数的间断点为 。当  时,;当  时,。左右极限存在但不相等,故  为第一类间断点。


(3)

连续函数  在区间  上的图形分别是直径为  的上、下半圆周,在区间  上的图形分别是直径为  的上、下半圆周。设 ,则下列结论正确的是( )

A. 
 B. 
 C. 
 D. 

答案: C

解析: 由图形可知  为奇函数,故  为偶函数,。又 ,因此 


(4)

设函数  在  连续,则下列命题错误的是( )

A. 若  存在,则 
 B. 若  存在,则 
 C. 若  存在,则  存在
 D. 若  存在,则  存在

答案: D

解析: 取 ,则  存在,但  在  处不可导,故 D 错误。


(5)

曲线  的渐近线的条数为( )

A. 
 B. 
 C. 
 D. 

答案: D

解析: 当  时,,故  是铅直渐近线;当  时,,故  是水平渐近线;当  时,,且 ,故  是斜渐近线。共有  条渐近线。


(6)

设函数  在  上具有二阶导数,且 ,令 ,则下列结论正确的是( )

A. 若 ,则  必收敛
 B. 若 ,则  必发散
 C. 若 ,则  必收敛
 D. 若 ,则  必发散

答案: D

解析: 因 ,所以  严格递增。由拉格朗日中值定理,,其中 。若 ,则 ,从而  递增且趋于 ,故发散。


(7)

二元函数  在点  处可微的一个充分条件是( )

A. 

B.  且 

C. 

D.  且 

答案: C

解析: 由 C 可得 ,即 ,其中 。这正符合可微定义,故 C 是充分条件。


(8)

设函数  连续,则二次积分  等于( )

A. 
 B. 
 C. 
 D. 

答案: B

解析: 原积分区域为 。换序后,,故选 B。


(9)

设向量组  线性无关,则下列向量组线性相关的是( )

A. 
 B. 
 C. 
 D. 

答案: A

解析: 因为 ,且系数不全为零,所以 A 中向量组线性相关。


(10)

设矩阵 ,则  与 ( )

A. 合同,且相似
 B. 合同,但不相似
 C. 不合同,但相似
 D. 既不合同,也不相似

答案: B

解析: 的特征值为  的特征值为 ,故二者不相似。但  均为实对称矩阵,且正惯性指数均为 ,负惯性指数均为 ,故二者合同。


2
二、填空题

(11)

 ________。

答案:

解析: 由 ,得 ,故原极限为 


(12)

曲线  上对应于  的点处的法线斜率为 ________。

答案:

解析:。代入 ,得 ,故法线斜率为 


(13)

设函数 ,则  ________。

答案:

解析: 由 ,得 。令 ,即得 


(14)

二阶常系数非齐次线性微分方程  的通解为  ________。

答案:

解析: 特征方程  的根为 ,齐次通解为 。设特解 ,代入得 ,故通解为 


(15)

设  是二元可微函数,,则  ________。

答案:

解析: 设 ,则 。整理得 


(16)

设矩阵 ,则  的秩为 ________。

答案:

解析: 直接计算得 ,故 


3
三、解答题

(17)

设  是区间  上的单调、可导函数,且满足

其中  是  的反函数,求 

解析: 两边对  求导,得 ,即 。当  时,,故 。由题设可得 ,所以 。因此 


(18)

设  是位于曲线  下方、 轴上方的无界区域。

(Ⅰ)求区域  绕  轴旋转一周所成旋转体的体积 

(Ⅱ)当  为何值时, 最小?并求出最小值。

解析:

(Ⅰ)由旋转体体积公式,

因为 ,所以

(Ⅱ)求导得

令 ,得 。此时  取最小值,且


(19)

求微分方程  满足初始条件  的特解。

解析: 令 ,则 。原方程化为 ,即 。解得 。由  得 ,故 。于是 ,积分并用 ,得 


(20)

已知函数  具有二阶导数,且 ,函数  由方程  所确定。设 ,求  与 

解析: 由 ,得 。两边求导并代入 ,得 ;再求导得 

设 ,则 。有 ,故 

又 ,所以


(21)

设函数  在  上连续,在  内二阶可导且存在相等的最大值,又 ,证明:存在 ,使得 

解析: 令 。由题设可知存在 ,使得 。又 。在  与  上分别应用罗尔定理,得 。再对  用罗尔定理,得存在 ,使 ,即 


(22)

设二元函数

计算二重积分 ,其中 

解析: 记 。则

由对称性,

对第二项用极坐标,第一象限中  与  分别对应  与 。故

因此


(23)

设线性方程组

与方程

有公共解,求  的值及所有公共解。

解析: 将方程组与方程联立,对增广矩阵作初等行变换,可得有解条件为 ,故  或 

当  时,公共解为

其中  为任意常数。

当  时,公共解为


(24)

设 3 阶实对称矩阵  的特征值  是  的属于  的一个特征向量。记 ,其中  为 3 阶单位矩阵。

(Ⅰ)验证  是矩阵  的特征向量,并求  的全部特征值与特征向量;

(Ⅱ)求矩阵 

解析:

(Ⅰ)因 ,所以 。于是

故  是  的特征向量,对应特征值为 

设 ,则 。由 ,得  的全部特征值为 

属于  的全部特征向量为

属于  的特征向量与  正交,故满足 ,其全部特征向量为

其中  不同时为零。

(Ⅱ)取

则 。计算得

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  1. CONNECT:[ UseTime:0.000506s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000694s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 854642 LIMIT 1 [ RunTime:0.001643s ]
  9. UPDATE `article` SET `lasttime` = 1783759395 WHERE `id` = 854642 [ RunTime:0.010837s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002570s ]
  11. SELECT * FROM `article` WHERE `id` < 854642 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001117s ]
  12. SELECT * FROM `article` WHERE `id` > 854642 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000625s ]
  13. SELECT * FROM `article` WHERE `id` < 854642 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001178s ]
  14. SELECT * FROM `article` WHERE `id` < 854642 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000665s ]
  15. SELECT * FROM `article` WHERE `id` < 854642 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003265s ]
0.118932s