设正项等差数列an前n项和为Sn a1不等于a2 am ak an是数列中任意满足an-ak=ak-求具体过程.若根号Sm 根号Sk 根号 Sn 也成等差 求an 通项公式
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![设正项等差数列an前n项和为Sn a1不等于a2 am ak an是数列中任意满足an-ak=ak-求具体过程.若根号Sm 根号Sk 根号 Sn 也成等差 求an 通项公式](/uploads/image/z/12518338-58-8.jpg?t=%E8%AE%BE%E6%AD%A3%E9%A1%B9%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97an%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn+a1%E4%B8%8D%E7%AD%89%E4%BA%8Ea2+am+ak+an%E6%98%AF%E6%95%B0%E5%88%97%E4%B8%AD%E4%BB%BB%E6%84%8F%E6%BB%A1%E8%B6%B3an-ak%3Dak-%E6%B1%82%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B.%E8%8B%A5%E6%A0%B9%E5%8F%B7Sm+%E6%A0%B9%E5%8F%B7Sk+%E6%A0%B9%E5%8F%B7+Sn+%E4%B9%9F%E6%88%90%E7%AD%89%E5%B7%AE+%E6%B1%82an+%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F)
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