当前位置:首页>南京>南京大学数分3期末压轴题太抽象!考的还是数分吗

南京大学数分3期末压轴题太抽象!考的还是数分吗

  • 2026-06-23 11:02:26
南京大学数分3期末压轴题太抽象!考的还是数分吗

我们数海2025-2026年度最新一期的课程已经开始,全新课程与以往所有内容均不重复,有课程有讲义,更有全天答疑服务,零基础的你也不用担心,报名我们课程后好好学习,什么新领军、CMC或者考研数学,一律不在话下(今年高三毕业生如果上下两期都报,则可以各自优惠50!找我领取优惠券然后报名,带你开启逆天改命之路,用大学数学竞赛弥补高中数学的遗憾)

虽然说绝大多数学校的数分高代期末考试题都水的一批(直接照搬课本基础题或者作业原题,无一点挑战性),但是还是有少数的几个名校,一直坚持用心命题,考察有区分度,有意义的题目,其中之一就是华五高校——南京大学

来看一道南京大学之前的数分期末考试压轴题,异常的抽象...

这是某年(哪年我忘了)南京大学的数分3期末考试卷子,就单看这最后三道题,恐怕已经劝退99%的数学系本科生了!怕是一个也不会做,甚至可能读不懂题

我这里有南京大学历年来数分高代所有的期中期末考试完整试卷(PDF无答案),里面有大量的好题新题,非常有区分度也很有训练价值,可惜的是这份资料在互联网上你恐怕找不到!因此若有需要,可以来报班学习一下,我直接给你题目+分析+解答

今天我们来讲解一下全卷最后一题,这种题平时你在数学分析课程中估计完全没有见过,但是其实真的只需要微积分课本知识就能完成,而且还可以加强

  • 零基础顶多是做不出来,但是看懂没问题

问题与解析

是正整数,有限维线性空间满足对任意都有,给定,证明:存在,使得其体积满足且对任意,只要,就有中恒为零

若 ,取一个足够小的立方体即可。下面设 

取  的一组基,对 ,记

先说明:若 ,则存在某个点 ,使,否则  在  上恒成立,又,由连续性可知它恒为零。但  线性无关,所以系数全为零也即 ,这与  矛盾。

现在对每个固定的点 ,考虑单位球面上满足的那些 构成的集合。这是单位球面中的开集(若单位球面上某个满足要求,则单位球面上与相近的点也都具有该性质)。

由前面,这些开集覆盖整个单位球面。单位球面是紧集,根据有限覆盖定理,所以可用其中的有限个集合覆盖,也即可以取出有限个点使得对任意 ,总有某个  满足

取 ,使,令

有限个点不影响测度(体积),因此,从而

下面验证  满足要求。任取 ,写成,若 ,则 。令,由前面,存在某个 ,使得,于是

所以,因此若 ,只能有 恒成立,结论得证。

加强

是正整数,有限维线性空间满足对任意都有,证明:存在有限个点,使得对任意,只要,就有恒为零

证明已经蕴含在前面的过程当中,不再赘述

觉得我讲的好,想要看清题目本质,用初等方法和同济高数知识解决一切难题,或者希望在2026年的各大关键性考试中一鸣惊人,逆天改命,就来报名我们的数海考研竞赛全年班学习吧。

2026年度最新一期课程,正式开始!!!

2026数海考研竞赛班

我是16届CMC数学类决赛全国第一,15届国一前20,连续三年CMC初赛数学A类全省第一,作为授课和答疑老师,亲自带班教学,只为让你学有所成!

我们2025-2026年度上下两期课程现在已经开始,无特殊情况每周六下午更新一次(直播上课,讲义回放永久有效,随时可以看),课程简介如下(老学员优惠50,可以找我领取),扫码即可报名。

上课风格,模式,课时数,答疑等等和往期类似,但是内容是全新的,永不重复,课程大纲已经确定(扫码CCtalk可以查看,包括试听课)

2026数海课程简介

注意:考虑到很多学生手头资金不宽裕,我们将全年班拆分为上下两个半年班,合起来是完整一套内容。上下期课程相当于教材上下册的关系,如果只报名一个,内容是残缺的,有可能看不懂,所以建议都报名。
2026数海全年班下期课程正式开始&常见问题解答
注意:我们课程是零基础的,上百名大一新生报名课程都能轻松跟上。课程全覆盖考研数学、CMC、保研夏令营、课内数学以及清华新领军等等大学数学考试全部内容,数学类与非数学类均有系统课程。报名时不区分类别,报名后数学类与非数两组课程都随时可以看,并有全天答疑服务
注意:高三毕业生上下两期课程一起报名,则可以各自优惠50(原价1200,现在只要1100),报名前找我说明一下情况然后领取两张优惠券即可(注意仅限今年高三毕业生参与优惠活动!!!另外先领券再报名)
另外,CMC就是当今的升学神器,只要拿到决赛国一国二,基本上保研时候清北华五任你挑。
准大一新生应掌握的基本数学技能、习惯与方法
2026版高三毕业生暑假逆袭规划指南:实现入学即巅峰
祝贺学员7人国一!竞赛班17届CMC决赛战绩汇总

感兴趣的话就扫描上方二维码报名吧


为了给广大学生提供一个交流数学的平台,我们创立了“数海考研竞赛交流群”,进入该群(老群满员了,可以来下面这个7.0新群)无需报名任何课程也无需付费,扫码即可加入。欢迎大家来这里探讨数学问题,群内大佬云集,此外还有丰富的学习资料等你来拿!

本期课程的完整介绍(如试听课,学员反馈,竞赛班成绩与效果等等)可在CCtalk端查看

扫描二维码

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本期内容到此结束,感谢阅读。

作者:柯西永远爱你

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  1. CONNECT:[ UseTime:0.000851s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001359s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000529s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000495s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001109s ]
  6. SELECT * FROM `set` [ RunTime:0.000441s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001164s ]
  8. SELECT * FROM `article` WHERE `id` = 589181 LIMIT 1 [ RunTime:0.001944s ]
  9. UPDATE `article` SET `lasttime` = 1782331284 WHERE `id` = 589181 [ RunTime:0.001104s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000466s ]
  11. SELECT * FROM `article` WHERE `id` < 589181 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000793s ]
  12. SELECT * FROM `article` WHERE `id` > 589181 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001029s ]
  13. SELECT * FROM `article` WHERE `id` < 589181 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000914s ]
  14. SELECT * FROM `article` WHERE `id` < 589181 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003938s ]
  15. SELECT * FROM `article` WHERE `id` < 589181 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001136s ]
0.088724s