数列an的前n项和是sn 若数列an的各项按如下规则排列1/2,1/3,2/3,1/4,2/4,3/4,1/5,2/5,3/5,4/5,1/6,.数列an的前n项和是Sn 若数列an的各项按如下规则排列1/2,1/3,2/3,1/4,2/4,3/4,1/5,2/5,3/5,4/5,1/6,.若存在整数k 使s(
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![数列an的前n项和是sn 若数列an的各项按如下规则排列1/2,1/3,2/3,1/4,2/4,3/4,1/5,2/5,3/5,4/5,1/6,.数列an的前n项和是Sn 若数列an的各项按如下规则排列1/2,1/3,2/3,1/4,2/4,3/4,1/5,2/5,3/5,4/5,1/6,.若存在整数k 使s(](/uploads/image/z/106120-64-0.jpg?t=%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E6%98%AFsn+%E8%8B%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%90%84%E9%A1%B9%E6%8C%89%E5%A6%82%E4%B8%8B%E8%A7%84%E5%88%99%E6%8E%92%E5%88%971%2F2%2C1%2F3%2C2%2F3%2C1%2F4%2C2%2F4%2C3%2F4%2C1%2F5%2C2%2F5%2C3%2F5%2C4%2F5%2C1%2F6%2C.%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E6%98%AFSn+%E8%8B%A5%E6%95%B0%E5%88%97an%E7%9A%84%E5%90%84%E9%A1%B9%E6%8C%89%E5%A6%82%E4%B8%8B%E8%A7%84%E5%88%99%E6%8E%92%E5%88%971%2F2%2C1%2F3%2C2%2F3%2C1%2F4%2C2%2F4%2C3%2F4%2C1%2F5%2C2%2F5%2C3%2F5%2C4%2F5%2C1%2F6%2C.%E8%8B%A5%E5%AD%98%E5%9C%A8%E6%95%B4%E6%95%B0k+%E4%BD%BFs%EF%BC%88)
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