设正数数列{an}前项和为Sn,且存在正数t,使得对所有正整数n有更号下tS=(t+an)/2.则通过归纳猜想可得到Sn=?写出基本步揍!
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![设正数数列{an}前项和为Sn,且存在正数t,使得对所有正整数n有更号下tS=(t+an)/2.则通过归纳猜想可得到Sn=?写出基本步揍!](/uploads/image/z/10365621-69-1.jpg?t=%E8%AE%BE%E6%AD%A3%E6%95%B0%E6%95%B0%E5%88%97%7Ban%7D%E5%89%8D%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E4%B8%94%E5%AD%98%E5%9C%A8%E6%AD%A3%E6%95%B0t%2C%E4%BD%BF%E5%BE%97%E5%AF%B9%E6%89%80%E6%9C%89%E6%AD%A3%E6%95%B4%E6%95%B0n%E6%9C%89%E6%9B%B4%E5%8F%B7%E4%B8%8BtS%3D%28t%2Ban%29%2F2.%E5%88%99%E9%80%9A%E8%BF%87%E5%BD%92%E7%BA%B3%E7%8C%9C%E6%83%B3%E5%8F%AF%E5%BE%97%E5%88%B0Sn%3D%3F%E5%86%99%E5%87%BA%E5%9F%BA%E6%9C%AC%E6%AD%A5%E6%8F%8D%21)
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