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Re:我想知道这题怎么推的啊~~

Posted by YUMEN19850720 at 2006-06-28 23:50:00 on Problem 2506
In Reply To:我想知道这题怎么推的啊~~ Posted by:hapboylin at 2006-05-06 22:15:26 
A[1]=1,A[2]=3,A[n]=A[n-1]+2*A[n-2]
注意数目的范围
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