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Re:怀疑这个题的物理前提 是错的 我也这么认为,但我还有别的想法

Posted by wanghexiang221 at 2006-10-27 08:45:47 on Problem 1003
In Reply To:怀疑这个题的物理前提 是错的 Posted by:yinxg at 2006-10-04 16:48:44
> 与同学讨论,感觉应该是:
> 1/2+1/4+1/8+............,极限为1

我觉得好象是
1/(2*1) +1/(2*2) +1/(2*3) +1/(2*4) +.....
=(1/2)*(1/1+1/2+1/3+1/4+....)

我的推导是这样的:
设Si为前i张扑克最大探出距离,S0=0,S1=1/2
由重心公式,加上第i+1张扑克后最大的探出距离是:
Si+1 = ( Si*(i+1) + 1/2 ) / (i+1) , i=0,1,2,3,...
Si+1 - Si = 1/(2*(i+1))

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