zscas36217's submissions for 1175 等比数列

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zscas36217
on Dec. 17, 2007, 11:40 a.m.
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zscas36217
on Dec. 16, 2007, 8:00 p.m.
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zscas36217
on Dec. 16, 2007, 11:17 a.m.
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152.00 KB