沈佳's submissions for 1175 等比数列

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沈佳
on March 8, 2013, 4:24 p.m.
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沈佳
on March 8, 2013, 4:19 p.m.
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164.00 KB
沈佳
on March 8, 2013, 4:17 p.m.
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164.00 KB
沈佳
on March 8, 2013, 4:14 p.m.
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164.00 KB