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推公式

Posted by ray58750034 at 2006-07-05 15:52:18 on Problem 2854
In Reply To:这个题目怎么回事啊，有没有解题报告？ Posted by:xiehe at 2006-07-05 14:34:21 
AC=10:00 AD=12:00 CD=13:00 取速度为vx x为abcd中某一个
所以 (va+vd):(vc+vd) = 3:2 
......类似的

最后速度消光就出来了。
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