回复：答案

来源: jinjing 于 2010-05-02 12:03:38 [] [旧帖] [给我悄悄话] 阅读数 : (263 bytes)
回答: 用天平称39个乒乓球 由 Blue_Diamond 于 2010-05-01 21:01:19

3 time is enough for 13 balls:

1)absde efghi if balance,we can get one from jkl.not balance(left W)
2)afgh ebsd taking off ei if balance we can get one from ei if left W bad one in ae,also can get it.If left L,one lighter one is in bsd,we get lighter.

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• 回复：回复：答案 -jinjing- ♀ 给 jinjing 发送悄悄话 (43 bytes) () 05/02/2010 postreply 12:32:38

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