问两道关于数列的题!急1.设数列{an}的前n项和为 Sn=n^2-8(1)求数列{│an│}的通项公式(2)若Hn=│a1│+│a2│+...+│an││,求Hn2.已知数列{an}满足a1=1,an=(an-1)/3an-1 +1) ,(n大于等于2,n属于N*)(1)求通项
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![问两道关于数列的题!急1.设数列{an}的前n项和为 Sn=n^2-8(1)求数列{│an│}的通项公式(2)若Hn=│a1│+│a2│+...+│an││,求Hn2.已知数列{an}满足a1=1,an=(an-1)/3an-1 +1) ,(n大于等于2,n属于N*)(1)求通项](/uploads/image/z/1997657-17-7.jpg?t=%E9%97%AE%E4%B8%A4%E9%81%93%E5%85%B3%E4%BA%8E%E6%95%B0%E5%88%97%E7%9A%84%E9%A2%98%21%E6%80%A51.%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BA+Sn%3Dn%5E2-8%281%29%E6%B1%82%E6%95%B0%E5%88%97%7B%E2%94%82an%E2%94%82%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%282%29%E8%8B%A5Hn%3D%E2%94%82a1%E2%94%82%2B%E2%94%82a2%E2%94%82%2B...%2B%E2%94%82an%E2%94%82%E2%94%82%2C%E6%B1%82Hn2.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3a1%3D1%2Can%3D%28an-1%29%2F3an-1+%2B1%29+%2C%EF%BC%88n%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E2%2Cn%E5%B1%9E%E4%BA%8EN%2A%29%EF%BC%881%29%E6%B1%82%E9%80%9A%E9%A1%B9)
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