已知数列{an}的前n项和为Sn,且S4=4,当n≥2时,满足an=1/2{根号(Sn)+根号(Sn-1)}求根号(Sn)关于n的表达式.和{an}的通项公式
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![已知数列{an}的前n项和为Sn,且S4=4,当n≥2时,满足an=1/2{根号(Sn)+根号(Sn-1)}求根号(Sn)关于n的表达式.和{an}的通项公式](/uploads/image/z/8625610-10-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94S4%3D4%2C%E5%BD%93n%E2%89%A52%E6%97%B6%2C%E6%BB%A1%E8%B6%B3an%3D1%2F2%7B%E6%A0%B9%E5%8F%B7%EF%BC%88Sn%EF%BC%89%2B%E6%A0%B9%E5%8F%B7%EF%BC%88Sn-1%29%EF%BD%9D%E6%B1%82%E6%A0%B9%E5%8F%B7%EF%BC%88Sn%EF%BC%89%E5%85%B3%E4%BA%8En%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.%E5%92%8C%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F)
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