已知a1=2,an+1=2an+3,则a4=多少

已知数列an满足a1=1,a(n+1)=an/(3an+2),则an=? 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an 已知数列an满足条件a1=-2 a（n+1）=2an/(1-an) 则an= 已知数列｛an｝中a1=1/2,a(n+1)=(2an)/(4an+3),求an. 已知数列{an}中,a1=1,a(n+1)=an/2an+3,则a5= 已知数列{an}中,a1=1/2,an+1+3an=0,an=( ) 已知｛an｝,a1=1,an+1=2/3an+1,求an 已知{an}满足a1=1.an=3*n+2An-1,求an 数列an中,a1=3,an+1=an/2an+1,则an=? (1)数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2),则a2005=____(2)已知数列｛an｝满足a1=1,a1×a2×a3…an=n^2,求an. 已知{an}满足a1=1,a(n+1)=2an+2,求an 已知数列{an},A1=1 A(n+1)=2an/an+2 求a5 已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列 已知数列{an}满足a1=4/3,2-a(n+1)=12/an+6则1/a1+2/a2+.1/an=? 1.已知数列｛an｝a1=-2,an+1=(1+an)/(1-an),则a2011=A.-2 B.-1/3C.-0.5D.0.5 已知无穷等比数列{an}的极限存在,且满足a1=a>0,an+1=2an+3/an,则liman=? 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an 已知数列{an}满足a1=2,an+1=2an/an+2,则an等于多少