here is one

來源: passenger101 於 2009-04-22 07:38:46 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (50 bytes)
回答: try the following links 由 passenger101 於 2009-04-20 11:44:09

http://www.artofproblemsolving.com/Forum/index.php

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