数列题,求证明数列{an}中,a1=1/4,a2=3/4,2an=an+1 +an-1 数列{bn}中,b1小于0,3bn-bn-1=n 前n项和为Sn 求证{bn-an}是等比数列求证{bn}是递增数列
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![数列题,求证明数列{an}中,a1=1/4,a2=3/4,2an=an+1 +an-1 数列{bn}中,b1小于0,3bn-bn-1=n 前n项和为Sn 求证{bn-an}是等比数列求证{bn}是递增数列](/uploads/image/z/1842871-31-1.jpg?t=%E6%95%B0%E5%88%97%E9%A2%98%2C%E6%B1%82%E8%AF%81%E6%98%8E%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D1%2F4%2Ca2%3D3%2F4%2C2an%3Dan%2B1+%2Ban-1+%E6%95%B0%E5%88%97%7Bbn%7D%E4%B8%AD%2Cb1%E5%B0%8F%E4%BA%8E0%2C3bn-bn-1%3Dn+%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn+%E6%B1%82%E8%AF%81%7Bbn-an%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E6%B1%82%E8%AF%81%7Bbn%7D%E6%98%AF%E9%80%92%E5%A2%9E%E6%95%B0%E5%88%97)
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