3道数列极限题目1.对任意n∈N,有an=[1+2+2^2+...+2^(n-1)]/[1-t*2^(n-1)],其中t与n无关的实常数,若liman=3t-5,求t的值2.已知数列{an},a4=28且满足[a(n+1)+an-1]/[a(n+1)-an+1]=n1)求a1,a2,a3,及{an}的通项2)设{bn}为等差数
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![3道数列极限题目1.对任意n∈N,有an=[1+2+2^2+...+2^(n-1)]/[1-t*2^(n-1)],其中t与n无关的实常数,若liman=3t-5,求t的值2.已知数列{an},a4=28且满足[a(n+1)+an-1]/[a(n+1)-an+1]=n1)求a1,a2,a3,及{an}的通项2)设{bn}为等差数](/uploads/image/z/1094300-44-0.jpg?t=3%E9%81%93%E6%95%B0%E5%88%97%E6%9E%81%E9%99%90%E9%A2%98%E7%9B%AE1.%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E2%88%88N%2C%E6%9C%89an%3D%5B1%2B2%2B2%5E2%2B...%2B2%5E%28n-1%29%5D%2F%5B1-t%2A2%5E%28n-1%29%5D%2C%E5%85%B6%E4%B8%ADt%E4%B8%8En%E6%97%A0%E5%85%B3%E7%9A%84%E5%AE%9E%E5%B8%B8%E6%95%B0%2C%E8%8B%A5liman%3D3t-5%2C%E6%B1%82t%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%2Ca4%3D28%E4%B8%94%E6%BB%A1%E8%B6%B3%5Ba%28n%2B1%29%2Ban-1%5D%2F%5Ba%28n%2B1%29-an%2B1%5D%3Dn1%29%E6%B1%82a1%2Ca2%2Ca3%2C%E5%8F%8A%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B92%29%E8%AE%BE%7Bbn%7D%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0)
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