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Re:这个题怎么做的啊

Posted by Sempr at 2007-02-01 17:04:51 on Problem 3101
In Reply To:这个题怎么做的啊 Posted by:daringQQ at 2007-02-01 16:38:19
固定一个,然后表示出其他的相对于这个固定的行星的速度

即 v=(T0-Ti)/(T0Ti)

然后使所有的v与一个最小的分数相乘都得到一个整数

那么这个分数应该是

所有T0Ti的LCM
-----------------
所有(T0-Ti)的GCD

求出这个解之后,再除以2就可以了,因为两个行星在对面也可以


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