问题描述:
已知等差数列{an}的公差不为零,且a3=5,a1,a2,a5成等比数列.
求数列{bn}满足 b1+2b2+22b3+…+2n-1bn=an,求数列{bn}的前n项和Tn,试比较Tn与(3n-1)/(n+1)的大小.
是数列{bn}满足 b1+2b2+4b3+…+2^(n-1)bn=an,上面有点错误
求数列{bn}满足 b1+2b2+22b3+…+2n-1bn=an,求数列{bn}的前n项和Tn,试比较Tn与(3n-1)/(n+1)的大小.
是数列{bn}满足 b1+2b2+4b3+…+2^(n-1)bn=an,上面有点错误
问题解答:
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