(1)f(2^an)=log2(2^an)-1/log2(2^an)=an-1/an=2n an^2-2nan-1=0
数列{an}的通项公式为:an=n-√(n^2-1)或an=n-√(n^2+1)(不符合0<x<1,舍去)
(2)an=n-√(n^2-1)=1/[n+√(n^2-1)]单调递增.
(1)f(2^an)=log2(2^an)-1/log2(2^an)=an-1/an=2n an^2-2nan-1=0
数列{an}的通项公式为:an=n-√(n^2-1)或an=n-√(n^2+1)(不符合0<x<1,舍去)
(2)an=n-√(n^2-1)=1/[n+√(n^2-1)]单调递增.