's submissions for 1042 求等差数列的和

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on Dec. 11, 2012, 8:33 p.m.
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on Dec. 6, 2012, 10:33 a.m.
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on Dec. 6, 2012, 10:31 a.m.
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on Dec. 6, 2012, 10:30 a.m.
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on Dec. 6, 2012, 10:28 a.m.
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on Dec. 6, 2012, 10:27 a.m.
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