努力吧's submissions for 1175 等比数列

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努力吧
on Oct. 31, 2008, 9:06 a.m.
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努力吧
on Oct. 31, 2008, 8:45 a.m.
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152.00 KB
努力吧
on Oct. 31, 2008, 8:42 a.m.
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152.00 KB