数列{an}中a1=4,a(n+1)=an/2+2/an(I)设bn=lg((an+2)/(an-2)),求证bn等比数列(II)求an

问题描述:

数列{an}中a1=4,a(n+1)=an/2+2/an(I)设bn=lg((an+2)/(an-2)),求证bn等比数列(II)求an