已知等差数列(an}得公差d不等于零,前n项的和为Sn 求证:点P1(1,S1/1),(2,S2/2),(3,S3/3).(n,Sn/已知等差数列(an}得公差d不等于零,前n项的和为Sn 求证:点P1(1,S1/1),(2,S2/2),(3,S3/3).(n,Sn/n)在同一条直线
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![已知等差数列(an}得公差d不等于零,前n项的和为Sn 求证:点P1(1,S1/1),(2,S2/2),(3,S3/3).(n,Sn/已知等差数列(an}得公差d不等于零,前n项的和为Sn 求证:点P1(1,S1/1),(2,S2/2),(3,S3/3).(n,Sn/n)在同一条直线](/uploads/image/z/6671552-32-2.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%88an%7D%E5%BE%97%E5%85%AC%E5%B7%AEd%E4%B8%8D%E7%AD%89%E4%BA%8E%E9%9B%B6%2C%E5%89%8Dn%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BASn+%E6%B1%82%E8%AF%81%EF%BC%9A%E7%82%B9P1%EF%BC%881%2CS1%2F1%29%2C%282%2CS2%2F2%29%2C%283%2CS3%2F3%29.%28n%2CSn%2F%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%88an%7D%E5%BE%97%E5%85%AC%E5%B7%AEd%E4%B8%8D%E7%AD%89%E4%BA%8E%E9%9B%B6%2C%E5%89%8Dn%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BASn+%E6%B1%82%E8%AF%81%EF%BC%9A%E7%82%B9P1%EF%BC%881%2CS1%2F1%29%2C%282%2CS2%2F2%29%2C%283%2CS3%2F3%29.%28n%2CSn%2Fn%29%E5%9C%A8%E5%90%8C%E4%B8%80%E6%9D%A1%E7%9B%B4%E7%BA%BF)
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