数列an满足an+1乘an=2an+1(n属于正整数),且a1=1,a2=2折数列an的前2012项
已知数列{an}的前n项和为Sn,且满足Sn=2an-1(n属于正整数),求数列{an}的通项公式an
已知数列{an}满足an>0且对一切n属于正整数,都有a1^3+a2^3+...+an^3=sn^2,sn是{an}的前
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
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
已知数列{an}满足a1=1,a2=2,a(n+2)=(an+a(n+1))/2,n属于正整数.求{an}的通项公式.
在数列{an}中,a1=-11,an+1=an+2(n属于正整数),求数列{|an|}的前n项和Sn.
(1)若数列{an}满足:a1=1,an+1=2an+1(n属于正整数),则该数列的通项公式an=?
数列{an}满足a1=3/2,an+1=an^2-an+1(n属于正整数),则m=1/a1+1/a2+……+1/a200
数列{an}满足a1+2a2+2^2a3+.+2^n-1an=n/2(n属于正整数),
已知数列{an}的前n项和为Sn,且满足Sn=2an-1,n为正整数,求数列{an}的通项公式an
设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数.
数列{an}满足a1=1,且an=an-1+3n-2,求an