已知数列An满足 A1=1/2 Sn=N²An 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}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中,a1=1,当n≥2时,其前n项和为Sn,满足Sn²=an(Sn-1)
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a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn
数列an满足a1=2,an+1=an²求an
已知数列{an}满足a1=1,a(n+1)=3an+2,求数列{an}的前n项和Sn.