84

回答: 又算錯,周期T約=85分.jinjing2011-09-14 09:57:13

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Thx, my earth radius is too long ,if it is 6370km,the answer is -jinjing- 給 jinjing 發送悄悄話 (59 bytes) () 09/15/2011 postreply 10:16:25

6370/6400*85=84 -jinjing- 給 jinjing 發送悄悄話 (0 bytes) () 09/15/2011 postreply 10:17:40

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