已知数列{an}的前n项和为sn,点(n,sn(n属于n+)在函数fx=1/2(x^2)+1/2x 1)求an通项公式 2)设数列{1/(anan+2}的前n项和为tn,不等式tn>1/3log a (1-a)对任意正整数n恒成立,求实数a取值范围
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![已知数列{an}的前n项和为sn,点(n,sn(n属于n+)在函数fx=1/2(x^2)+1/2x 1)求an通项公式 2)设数列{1/(anan+2}的前n项和为tn,不等式tn>1/3log a (1-a)对任意正整数n恒成立,求实数a取值范围](/uploads/image/z/11553429-21-9.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%E7%82%B9%EF%BC%88n%2Csn%EF%BC%88n%E5%B1%9E%E4%BA%8En%2B%EF%BC%89%E5%9C%A8%E5%87%BD%E6%95%B0fx%3D1%2F2%EF%BC%88x%5E2%EF%BC%89%2B1%2F2x+1%EF%BC%89%E6%B1%82an%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F+2%EF%BC%89%E8%AE%BE%E6%95%B0%E5%88%97%7B1%2F%EF%BC%88anan%2B2%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAtn%2C%E4%B8%8D%E7%AD%89%E5%BC%8Ftn%3E1%2F3log+a+%EF%BC%881-a%EF%BC%89%E5%AF%B9%E4%BB%BB%E6%84%8F%E6%AD%A3%E6%95%B4%E6%95%B0n%E6%81%92%E6%88%90%E7%AB%8B%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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