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伪武汉五调7题期望的计算

  • 2026-10-08 20:05:17
伪武汉五调7题期望的计算
这里先把X^3用组合数表示，再利用组合数的性质变形，转化为可以求解的形式，一部分为X~B（20，0.5），一部分为X~B（18，0.5）还有一部分为二项式系数和的形式。
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  1. 请求信息 : 2026-10-18 13:45:55 HTTP/2.0 GET : https://f.460.net.cn/a/557080.html
  2. 运行时间 : 0.059787s [ 吞吐率：16.73req/s ] 内存消耗：4,393.36kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=14718e269814672dee2986879db39119
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  1. CONNECT:[ UseTime:0.001292s ] mysql:host=127.0.0.1;port=3306;dbname=f460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002668s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000581s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000510s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.002056s ]
  6. SELECT * FROM `set` [ RunTime:0.000501s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001597s ]
  8. SELECT * FROM `article` WHERE `id` = 557080 LIMIT 1 [ RunTime:0.000522s ]
  9. UPDATE `article` SET `lasttime` = 1792302355 WHERE `id` = 557080 [ RunTime:0.002591s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000472s ]
  11. SELECT * FROM `article` WHERE `id` < 557080 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000755s ]
  12. SELECT * FROM `article` WHERE `id` > 557080 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000388s ]
  13. SELECT * FROM `article` WHERE `id` < 557080 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000613s ]
  14. SELECT * FROM `article` WHERE `id` < 557080 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000579s ]
  15. SELECT * FROM `article` WHERE `id` < 557080 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000648s ]
0.065621s