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....这样最下面一张会挂掉吧？In Reply To: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 > > 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)) Followed by:
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