syl's submissions for 1175 等比数列

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syl
on July 9, 2010, 11:39 p.m.
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164.00 KB
syl
on July 9, 2010, 11:37 p.m.
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164.00 KB
syl
on July 9, 2010, 11:34 p.m.
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164.00 KB