tian张若楠's submissions for 1175 等比数列

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tian张若楠
on Nov. 2, 2017, 5:35 p.m.
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tian张若楠
on Nov. 1, 2017, 9:15 p.m.
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tian张若楠
on Oct. 31, 2017, 4:15 p.m.
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