设无穷等差数列{an}的前n项和为Sn,若不等式an^2+Sn^2/n^2>=(t/5)a1^2对任意正整数n都成立,则实数t的最大值是()A.1 B.2 C.3 D.5稍微说点思路思路......
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![设无穷等差数列{an}的前n项和为Sn,若不等式an^2+Sn^2/n^2>=(t/5)a1^2对任意正整数n都成立,则实数t的最大值是()A.1 B.2 C.3 D.5稍微说点思路思路......](/uploads/image/z/2681860-4-0.jpg?t=%E8%AE%BE%E6%97%A0%E7%A9%B7%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E8%8B%A5%E4%B8%8D%E7%AD%89%E5%BC%8Fan%5E2%2BSn%5E2%2Fn%5E2%3E%3D%28t%2F5%29a1%5E2%E5%AF%B9%E4%BB%BB%E6%84%8F%E6%AD%A3%E6%95%B4%E6%95%B0n%E9%83%BD%E6%88%90%E7%AB%8B%2C%E5%88%99%E5%AE%9E%E6%95%B0t%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF%EF%BC%88%EF%BC%89A.1+B.2+C.3+D.5%E7%A8%8D%E5%BE%AE%E8%AF%B4%E7%82%B9%E6%80%9D%E8%B7%AF%E6%80%9D%E8%B7%AF......)
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