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真题精讲第8讲 |看到偏导别急着算!这类二阶偏导题,考的其实是“结构识别”

  • 2026-09-23 00:55:12
真题精讲第8讲 |看到偏导别急着算!这类二阶偏导题,考的其实是“结构识别”
📅每日一讲陪伴第273天

内容✍️ 姜晓千

排版🎨 养乐多

各位27考研弟子们，

欢迎开始晓千老师的「每日一讲」系列

每日一讲，先讲知识点，再讲做题方法，

让同学们扎扎实实地学好考研数学！

目前正在进行的是「真题精讲每日一讲」

今天要讲解的内容：

真题精讲（八）

01
PART
综合练习
02
PART
视频解析
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27考研数学

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上海古诗文大会2026考试安排及历年真题

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000646s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000723s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000374s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000331s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000506s ]
  6. SELECT * FROM `set` [ RunTime:0.000250s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000687s ]
  8. SELECT * FROM `article` WHERE `id` = 509939 LIMIT 1 [ RunTime:0.000319s ]
  9. UPDATE `article` SET `lasttime` = 1790251241 WHERE `id` = 509939 [ RunTime:0.001318s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000311s ]
  11. SELECT * FROM `article` WHERE `id` < 509939 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000382s ]
  12. SELECT * FROM `article` WHERE `id` > 509939 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000342s ]
  13. SELECT * FROM `article` WHERE `id` < 509939 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000455s ]
  14. SELECT * FROM `article` WHERE `id` < 509939 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000481s ]
  15. SELECT * FROM `article` WHERE `id` < 509939 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000989s ]
0.104500s