已知数列{An},Sn=0.125(An+2)(An+2).求证:{An}是等差数列
已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列
求此数列题详细解法已知数列an Sn=1/8(an+2)^2 求证an是等差数列
已知在数列an中,Sn=2n^2+3n,求证an是等差数列
已知数列{an}的前n项和为Sn=n^2-3n,求证:数列{an}是等差数列
已知数列{An}满足A1=1,An+1=2An+2^n.求证数列An/2是等差数列
在正整数数列{an}中,Sn=0.125(an+2)^2.(1)求证{an}是等差数列(2)若bn=0.5an-30,求
已知数列{an}得前n项和为sn=an^2+bn(a,b为常数且a不等于0)求证数列{an}是等差数列
已知数列{an}的前n项和为Sn,且满足an+2Sn*Sn-1=0,a1=1/2.求证:{1/Sn}是等差数列
已知数列{an}中,a2=2,前n项和为Sn,且Sn=n(an+1)/2证明数列{an+1-an}是等差数列
已知数列an其前n项和为Sn,且Sn=3n^2+5n,求证数列an是等差数列
已知数列an中,a1=1,当n大于等于2时,sn=an(1-2/sn).求证1/sn是等差数列
已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列