郑适夷's submissions for 1175 等比数列

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郑适夷
on Oct. 31, 2011, 8:31 p.m.
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郑适夷
on Oct. 31, 2011, 8:30 p.m.
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164.00 KB
郑适夷
on Oct. 31, 2011, 8:29 p.m.
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164.00 KB
郑适夷
on Oct. 31, 2011, 8:28 p.m.
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164.00 KB