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Re:跪求大牛，公式是怎样推出来的In Reply To:跪求大牛，公式是怎样推出来的 Posted by:zhouxiaozi at 2009-03-14 20:09:18 从上面的卡片往下看，设前n－1个超越的长度是L(n-1),则再加上最下面的一个共n个超越的长度设为L(n)， 可将上面的n-1个看成一个整体，最下面的单独看，则由力矩平衡可得，(n-1)m×(L(n)-L(n-1))=m×[1/2-(L(n)-L(n-1))] （其中m为各个卡片的质量）,化简下即得递推关系式：L(n)-L(n-1)=1/2n Followed by:
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