天琪's submissions for 1175 等比数列

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天琪
on Jan. 9, 2013, 2:55 p.m.
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天琪
on Jan. 9, 2013, 2:54 p.m.
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164.00 KB
天琪
on Jan. 9, 2013, 2:50 p.m.
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164.00 KB