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正余弦定理的实际应用问题教案

  • 2026-04-11 15:40:27
正余弦定理的实际应用问题教案
先做后讲，做了一个小时，讲了一节课，整理了一节课。
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  1. CONNECT:[ UseTime:0.000440s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000570s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000382s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000315s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000526s ]
  6. SELECT * FROM `set` [ RunTime:0.000231s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 484528 LIMIT 1 [ RunTime:0.000330s ]
  9. UPDATE `article` SET `lasttime` = 1776759511 WHERE `id` = 484528 [ RunTime:0.000744s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000228s ]
  11. SELECT * FROM `article` WHERE `id` < 484528 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `article` WHERE `id` > 484528 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000454s ]
  13. SELECT * FROM `article` WHERE `id` < 484528 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000897s ]
  14. SELECT * FROM `article` WHERE `id` < 484528 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000936s ]
  15. SELECT * FROM `article` WHERE `id` < 484528 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001013s ]
0.143321s