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南京林业大学 2023-2024 高等数学下期末试卷

  • 2026-06-24 23:58:57
南京林业大学 2023-2024 高等数学下期末试卷

南京林业大学 2023-2024 高等数学下期末试卷(A卷)

一、选择题:(每小题3分,共30分)

1、 设  是两个向量,则下列式子必定正确的是( )。

(A) 

(B) 

(C) 

(D) 

2、 方程  所表示的曲面是( )。

(A) 椭圆抛物面

(B) 双曲抛物面

(C) 圆锥面

(D) 椭球面

3、 极限  ( )。

(A) 等于1 (B) 等于0 (C) 等于2 (D) 不存在

4、 函数  在点  处的全微分  ( )。

(A) (B) 

(C) (D) 

5、 若函数  在驻点  的某个邻域内有连续二阶偏导数,且满足 ,则  ( )。

(A) 必不是  的极值点

(B) 必是  的极值点

(C) 必是  的极小值点

(D) 必是  的极大值点

6、 设  是由柱面  及平面  所围成的立体区域,则  ( )。

(A) (B) (C) (D) 

7、 设曲面  是上半球面:,曲面  是曲面  在第一卦限中的部分,则下列正确的是( )。

(A) 

(B) 

(C) 

(D) 

8、 下列级数中,是条件收敛的是( )。

(A) 

(B) 

(C) 

(D) 

9、 设  是周期为  的周期函数,它在 上的表达式为则  的傅里叶级数在  处收敛于( )。

(A) 0 (B) 1 (C) 1.5 (D) 2

10、 微分方程  的特解形式可设为( )。

(A) 

(B) 

(C) 

(D) 

二、填空题:(每小题 4 分,共 20 分)

1. 过直线  与平面  的交点,且与直线  垂直的平面  方程为________。

2.,其中  具有连续二阶偏导数,则  ________。

3. ________。

4. 设  为椭圆 ,其周长为 ,则  ________。

5. 级数  ________。

三、计算题:(每小题 8 分,共 40 分)

1. 设函数  由方程  所确定(其中  具有连续偏导数),求 

2. 已知函数 ,设  为曲面  在点  处的切平面, 为  与坐标平面所围成的有界区域在  面上的投影。

(1) 求  的方程;

(2) 求  在  上的最大值和最小值。

3. 设在  面上曲线积分  与路径无关,

(1) 求常数 

(2) 求 

4. 设空间有界区域  由柱面  与平面  和平面  围成, 是  边界的外侧,计算曲面积分:

5. 将  展开成  的幂级数;对于任意 ,判别不等式  是否成立。

四、应用题:(本题 10 分)

设函数  具有连续导数, 满足

若 ,求  的表达式。


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参考解答

一、选择题

1、 ,选 B

2、  是椭圆抛物面,选 A

3、 取 ,极限为 ,随  变化,故极限不存在,选 D

4、在  处,,所以选 C

5、 驻点处 ,且 ,则故不是极值点,选 A

6、 区域为圆柱体,体积 ,所以选 D

7、 上半球面关于坐标面对称,只有  正确,选 C

8、  满足莱布尼茨条件,但绝对值级数  发散,故条件收敛,选 B

9、 在  处为间断点,傅里叶级数收敛于选 D

10、 非齐次项为一次多项式,且  不是特征根,故特解可设为选 A

二、填空题

1.直线  的参数方程为代入平面  得:所以交点为 与直线  垂直的平面,其法向量取  的方向向量 ,故平面方程为:

2.设 ,则 

再对  求偏导:

因此

3.交换积分次序。区域为 

即 

所以

4.椭圆方程:两边同乘 ,得:

因此

5.级数拆项:

其中

所以总和为

三、计算题

1. 解:

对  求偏导( 固定):

所以

对  求偏导( 固定):

所以

因此

2. 解(1):

在点  处:

切平面方程为

(2) 与坐标平面围成的区域在第一卦限,故

内部驻点:

两式相减:

代入得

驻点为 

边界讨论:

  • 边界 求导得驻点 ,值为 ,端点值为  和 

  • 边界 : 同理最小值为 ,最大值为 

  • 边界 ,即 顶点  处取最小值 ,端点处取最大值 

比较所有可能最值:

所以最大值为 ,最小值为 

3. 解(1):

积分与路径无关的条件为

所以

(2)当  时,

存在原函数 ,使得

4. 解:

由高斯公式:

计算:

区域  为

其中  和  关于  均为奇函数,区域关于  对称,故积分为 

于是

所以

用极坐标:

展开:

第一项为 ,第二项为 ,第三项为

因此

5. 解:因为

所以

奇数项抵消,偶数项相加:

于是

其中  项为  项为 ,所以

因此对任意 ,都有当且仅当  时等号成立。

四、应用题

解:设  

计算偏导数:

代入方程左边:

右边为

于是有

约去 ,得

下面解一阶线性微分方程:

齐次通解:

设特解 ,代入:

比较系数得

所以

由 

因此

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  1. CONNECT:[ UseTime:0.000820s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001497s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000699s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000645s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001515s ]
  6. SELECT * FROM `set` [ RunTime:0.000536s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001309s ]
  8. SELECT * FROM `article` WHERE `id` = 592190 LIMIT 1 [ RunTime:0.001067s ]
  9. UPDATE `article` SET `lasttime` = 1782324672 WHERE `id` = 592190 [ RunTime:0.001396s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000694s ]
  11. SELECT * FROM `article` WHERE `id` < 592190 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001899s ]
  12. SELECT * FROM `article` WHERE `id` > 592190 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001291s ]
  13. SELECT * FROM `article` WHERE `id` < 592190 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004611s ]
  14. SELECT * FROM `article` WHERE `id` < 592190 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007398s ]
  15. SELECT * FROM `article` WHERE `id` < 592190 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004638s ]
0.191558s