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人的一生参与多少次数分高代考试?刘神给出了答案!

  • 2026-01-19 15:33:08
人的一生参与多少次数分高代考试?刘神给出了答案!
❝

人的一生参与多少次数分高代考试？刘神给出了答案！

题目

定点在球面内部，为球面上三点，满足两两垂直，以为棱作平行六面体，是平行六面体上与相对的顶点，证明：为定值

分析

高考题

解答

证明 的长度等于常数即可．根据题设条件可知

以及

于是，有

由于

因此

是一个定值，即点  在以  为球心的一个球面上．

数海竞赛班

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  1. CONNECT:[ UseTime:0.000382s ] mysql:host=127.0.0.1;port=3306;dbname=b_mffb;charset=utf8mb4
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  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000602s ]
  6. SELECT * FROM `set` [ RunTime:0.001605s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000593s ]
  8. SELECT * FROM `article` WHERE `id` = 459901 LIMIT 1 [ RunTime:0.100552s ]
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