An+1^2=An^2+4,且a1=1,an>0,则An=?

An+1^2=An^2+4,且a1=1,an>0,则An=? 已知a1=2,an不等于0,且an+1-an=2an+1an,求an 数列an中,a1=3,an+1=an/2an+1,则an=? 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 数列an满足a1=2,an+1=4an+9,则an=? 一直数列{an}满足a1=0,an=（an-1 +4）/(2an-1) ,求 an 已知数列{an}中,a1=1,a(n+1)>an,且[a(n+1)-an]^2-2[a(n+1)+an]+1=0,则an 设数列{An}的各项都是正数,且A1=1,(An)+1/(An+1)+1=(An+1)/2An,Bn=An平方+An. 在数列an中,a1=2 an+1=an+3n则an= 在等差数列an中,a1=2,3an+1-an=0,求an 已知{an}中a1=1 且an+1=3an+4求an 在数列{an}满足a1=0,且an=1/4(an-1 +3)(n=2,3…)求an?我知道an-an-1=1/4(an-