等差数列的三个正数和为15,并且这三个数加上2 5 13后成等比数列{Bn}中的b2 b3 b51.求bn通项公式2.数列bn的前n项和为Sn,求证“{Sn+四分之五}是等比数列
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![等差数列的三个正数和为15,并且这三个数加上2 5 13后成等比数列{Bn}中的b2 b3 b51.求bn通项公式2.数列bn的前n项和为Sn,求证“{Sn+四分之五}是等比数列](/uploads/image/z/15233313-57-3.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E7%9A%84%E4%B8%89%E4%B8%AA%E6%AD%A3%E6%95%B0%E5%92%8C%E4%B8%BA15%2C%E5%B9%B6%E4%B8%94%E8%BF%99%E4%B8%89%E4%B8%AA%E6%95%B0%E5%8A%A0%E4%B8%8A2+5+13%E5%90%8E%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7BBn%7D%E4%B8%AD%E7%9A%84b2+b3+b51.%E6%B1%82bn%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F2.%E6%95%B0%E5%88%97bn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%EF%BC%8C%E6%B1%82%E8%AF%81%E2%80%9C%EF%BD%9BSn%2B%E5%9B%9B%E5%88%86%E4%B9%8B%E4%BA%94%EF%BD%9D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97)
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