tian王启兴's submissions for 1175 等比数列

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tian王启兴
on Nov. 6, 2017, 10:19 p.m.
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tian王启兴
on Oct. 31, 2017, 4:43 p.m.
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tian王启兴
on Oct. 31, 2017, 4:41 p.m.
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tian王启兴
on Oct. 31, 2017, 4:40 p.m.
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