已知数列an满足a1=1/2 sn=n平方×an 求an
已知数列an满足a1=1/2 sn=n平方×an 求an
已知数列{an},满足a1=1/2,Sn=n²×an,求an
已知数列{an}的前N项和Sn与an之间满足a1=1,Sn=n的平方*an,求{an}
已知数列{an}a1=2前n项和为Sn 且满足Sn Sn-1=3an 求数列{an}的通项公式an
已知数列{an}满足a1=1/2,sn=n^2an,求通项an
已知数列{an}满足a1=1/2,an+1=an+1/n的平方+n求an
已知数列{an}满足an+1+an=4n-3 当a1=2时,求Sn
已知数列{an}满足an+1=2an+3.5^n,a1=6.求an
已知数列An的前n项和Sn满足An+2Sn*Sn-1=0,n大于等于2,A1=1/2,求An.
已知数列{an}的前n项和满足a1=1/2,an=-Sn*S(n-1),(n大于或等于2),求an,Sn
已知数列An满足An>0,其前n项和为Sn为满足2Sn=An的平方+An(1)求An(2)设数列Bn满足An/2的n次方
已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn