field's submissions for 1175 等比数列

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field
on March 19, 2009, 3:18 p.m.
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field
on March 19, 2009, 2:49 p.m.
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field
on March 19, 2009, 2:47 p.m.
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152.00 KB
field
on March 19, 2009, 2:36 p.m.
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152.00 KB