已知数列满足a1=1/2,an+1=2an/(an+1),求a1,a2

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+a2+a3+...+an=n^2+2n.(1)求a1,a2,a3,a4 已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an 一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An 已知数列{an}满足a1=1,an=a1+1/2a2+1/3a3+...+1/n-1an-1(n>1)求数列{an}的通 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 已知数列{an}满足:a1=1,且an-an-1=2n,求(1)a2,a3,a4.(2)求数列{an}的通项an 关于数列极限的已知数列an满足a1=0 a2=1 an=(an-1+an-2)/2 求lim(n->无穷）an 已知数列(an)满足a1=1,an+1=2an/an+2(n∈N*) 求a2,a3,a4,a5 猜想数列(an)的通项公 已知数列{An}满足a1=1,An+1=2An+1.求A1+A2+A3+…+An的值 已知数列｛An｝满足（n+1)an-nan+1=2,且a1=3.求an的通项公式,（2）,求和：（a1+a2)+(a2+ 已知数列{an}满足a1=1,a2=-13,an+2-2an+1+an=2n-6