http://science6.2ch.net/test/read.cgi/math/1226660373/106 2009/01/01 08:35:45
http://science6.2ch.net/test/read.cgi/math/1221044502/453 2009/01/01 08:36:06
http://science6.2ch.net/test/read.cgi/math/1212275954/250 2009/01/01 08:36:25