柺敀偄栤戣偍偟偊偰乣 ..
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701:僀僫
20/03/09 20:33:49.52 otlyxJ1y.net
慜
>>682
倎_5=480側傜丄
倎_n=n^2(n-1)倎_n-1
偙偆偐丠
480=548
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