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中国科学院大学2026年数学分析考研真题解答

  • 2026-01-30 17:30:37
中国科学院大学2026年数学分析考研真题解答

2025年已成过去了,我们应该向前看,继续在2026年发光发亮,26考研已过去一周多了,接下来就是等待成绩,今天也算是新年,开篇我就给大家做了这份中科院数学分析真题,难度适中,论计算量也没那么大.

前天我也更新了数分高代习题讲义2027考研版,在这里打算送同大家一本数分讲义一本高等讲义,祝大家新年快乐!

留言区2楼送一本数分讲义,6楼送一本高代讲义,截止时间1月3号晚9点.

中科院 2026 年数分真题解答

1.计算极限.(1) .(2) .

解. (1) 利用Stolz-Cesaro定理可得,

或者利用夹逼放缩

(2) 令 ,则有

所以

2.设数列  满足 , 证明:  收敛, 并求其极限值.

证. (方法一) 易知

由数学归纳法可得,即

  • 如果可得,即当此条件成立时,单调递增且有上界. 所以根据单调有界可得极限存在设为,对递推公式两边取极限得,则,由于,则.
  • 如果,此时单调递减且有下界,所以根据单调有界可得极限存在设为,对递推公式两边取极限得,则,由于,则.

综上得.

(方法二)观察到

可知  递增但  递减, 且  事实上明显的不等式  推出  和  更进一步

令  和  得到  且  从而有  即 

(方法三)易得

3.设  均为非零实数,证明:

在限制条件  下的最小值存在,并求之.

解. 利用Cauchy-Schwarz不等式得到

故  的最小值为  ,等号成立当且仅当

时成立,此时  ,其中  .

4.设  在  上二阶连续可导,在  内取得最大值,且在  上 (  为正常数).证明

证. 设  在  处取得极大值,由费马引理可知

分别在区间  和  上应用拉格朗日中值定理

于是

5.计算第二型曲面积分

其中  为上半椭球面 , 取上侧.

解. 利用高斯公式可得

其中  表示整个椭球体. 令 ,则椭球  变为单位球  ,此时  ,故

其中

所以

6.设  在全平面上有连续偏导数, 且对以任意  为中心,以任意正数  为半径的上半圆周  恒有

求证: .

证. 由题设条件对平面上任意一点  ,以  为中心,任意  为半径作一上半圆域 ,则对  内的一点  有

又有

所以

令  ,取极限得 . 由  的任意性,可知  .

从而有  .令  ,取极限得  .由  的任意性,可知  .

因此

7.求含参积分 .

解. 这是Laplace积分,对任意的  有

故  在  上一致收敛. 显然, 在  上一致收敛.由可微性定理知,  对  的微商可在积分号下进行,并有

上式又可对  在积分号下求微商,于是又有

这是一个二阶常系数线性微分方程,求得通解为

其中  为任意常数.其初值 ,所以可得

故得到

8.已知 , 证明:

证. 令 ,所以有

9.证明:

其中 .

证.  所证结论的左端积分,即为单位球面  上的曲面积分

要证结论应将  变成  .

令  ,作坐标旋转.

在  的平面上取正交轴  ,使  成右手系,这时  变成  .或将  写为柱面坐标,即

这时

因此

10.设,证明: .

证. 这个题但凡考中科院的同学都知道这是22年中科院考研真题,竟然这次命题又出一次. 此题其实这就是用一下Riemann引理的推论(令)就可以了,此处简单叙述并证明:


,且为周期,且,则

证明: 先设,将等分为份,根据积分中值定理可知,,其中,

使得

其中.令,再由为周期,则可知

根据定积分定义可知

于是

对于一般的,可设是其在区间上的下确界(最小值),则

并以为周期.于是

两边消去,即可证明结论.


所以此题就是一句话的事(的周期为):

注释: Riemann引理,即: 若,且为周期,且,则


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  1. CONNECT:[ UseTime:0.000538s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000836s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000249s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000454s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000528s ]
  8. SELECT * FROM `article` WHERE `id` = 457999 LIMIT 1 [ RunTime:0.000474s ]
  9. UPDATE `article` SET `lasttime` = 1770185529 WHERE `id` = 457999 [ RunTime:0.001999s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000255s ]
  11. SELECT * FROM `article` WHERE `id` < 457999 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003901s ]
  12. SELECT * FROM `article` WHERE `id` > 457999 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000490s ]
  13. SELECT * FROM `article` WHERE `id` < 457999 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002429s ]
  14. SELECT * FROM `article` WHERE `id` < 457999 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000709s ]
  15. SELECT * FROM `article` WHERE `id` < 457999 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001015s ]
0.084004s