kongfanqing 发表于 2010-8-12 20:43

第四题

Nine Ballshttp://www.puzzleup.com/2010/img/puzzle/2010/05.jpgYou have nine balls, three of which are slightly heavier, and three of which are slightly lighter than the normal three. All three balls in each group have the same weight. All nine balls are identical otherwise. Your mission is to determine the group of every ball using a pair of scales.

How many weighings are needed in order to ensure the accomplishment of your mission?

Notes:
1. The difference of weight between the heavy and normal balls is not necessarily equal to the difference of weight between the light and normal balls.
2. The scales show only which side is heavier; it does not show the difference of weight.

一粒芥菜 发表于 2010-8-12 23:34

试题有论文吗？？？

dongsl2 发表于 2010-8-26 11:33

顶顶更健康，越顶吃的越香。

sxxxph 发表于 2010-8-26 11:34

强人，佩服死了。呵呵，不错啊

zhoulb 发表于 2010-8-26 11:35

哦～～

lsp041 发表于 2010-8-26 11:36

我来了~~~~~~~~~ 闪人~~~~~~~~~~~~~~~~  

yb003 发表于 2010-8-26 11:38

我来了~~~~~~~~~ 闪人~~~~~~~~~~~~~~~~  

Ryudo 发表于 2010-8-26 11:45

试试运气啦~~~~~~~~~~~

hippocampus81 发表于 2010-8-26 13:52

试试运气啦~~~~~~~~~~~

zzl9876 发表于 2010-8-26 18:59

强人，佩服死了。呵呵，不错啊
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