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枫下沙龙 / 休闲娱乐 / 13个球,其中1个和其它球重量不同,如何用天平在3次内把它找出来?
-guest:guest;
2001-8-23
(#177664@0)
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对于N(m)=(3^m-1)/2个小球,现在我们来寻求m次的解法。。。
-scorpio(scorpio);
2001-8-23
{1630}
(#177678@0)
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实在看不懂,你还是以13个球(即M=3)举例子吧
-guest:;
2001-8-24
(#177819@0)
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数学归纳法
-scorpio(scorpio);
2001-8-24
(#177847@0)
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(1) 6,7 if(6) then 3,3, then 1,1 and 1; if(7) then 3,3, then 1,1, and 1
-uid(㊣Miracle);
2001-8-23
(#177685@0)
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But you don't know the special ball is heavy or light than other balls! So your answer is not right.
-guest:guest;
2001-8-23
(#177691@0)
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1, 2/2 以后就可以了,自己想吧
-elsa(青虫);
2001-8-23
(#177708@0)
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哎,这老套的题不知道还能出多久?
-guest:;
2001-8-23
(#177724@0)
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别用GUEST了,这种问题准是金字塔提出的。
-guest:guest;
2001-8-24
(#177833@0)