试题与答案

已知等差数列{an}是递增数列,且不等式x2-6x+8<0的解集为{x|a2<x

题型:解答题

题目:

已知等差数列{an}是递增数列,且不等式x2-6x+8<0的解集为{x|a2<x<a4}.
(1)求数列{an}的通项公式;
(2)若bn=
1
anan+1
,求数列{bn}的前项的和Sn

答案:

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