已知数列{an}是各项均不为0的等差数列,公差为d,Sn为其前n项和,且满足an^2=S2n-1,n∈N*,数列{bn}满
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已知数列{an}是各项均不为0的等差数列,公差为d,Sn为其前n项和,且满足an^2=S2n-1,n∈N*,数列{bn}满
足bn=1/(an·an+1),Tn为数列{bn}的前n项和.
(1)求a1、d、和Tn
(2)若对任意的n属于N*,不等式λTn
数学人气:984 ℃时间:2020-02-03 22:41:41
优质解答
an²=S2n-1a1²=S1a1=1、0数列{an}是各项均不为0的=>a1=1an²=S2n-1a2²=S3=a3+a2+a1(a1+d)²=a1+2d+a1+d+a1d²+2d+1=3d+3d²-d-2=0d=2、-1数列{an}是各项均不为0的=>a2!=1-1=>d=2b...
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an²=S2n-1a1²=S1a1=1、0数列{an}是各项均不为0的=>a1=1an²=S2n-1a2²=S3=a3+a2+a1(a1+d)²=a1+2d+a1+d+a1d²+2d+1=3d+3d²-d-2=0d=2、-1数列{an}是各项均不为0的=>a2!=1-1=>d=2b...