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1年前
回答问题
Sn为等差数列前n项和,a2n/an=4n-1/2n-1,S2n/Sn=?
1年前2个回答
已知等差数列{an}的前n项和为Sn,且(2n-1)Sn+1 -(2n+1)Sn=4n²-1(n∈N*)
已知等差数列{an}的前n项和为Sn,且(2n-1)Sn+1-(2n+1)Sn=4n^2-1(n属于正整数)求数列{an
在等差数列{an}中,已知Sn,S2n,S3n分别表示数列的前n项和,前2n项和,前3n项和.求证:Sn,S2n-Sn,
1年前1个回答
已知{an}是等差数列 求证Sn,S2n-Sn,S3n-S2n成等差数列
等差数列{an}的前几项的和为Sn,且a2n/an=(4n-1)/(2n-1),则S2n/Sn
在等差数列an中,Sn为an的前n项和,sn=1/2n*2+3/2n,求通项公式
关于数列的一道题记Sn为数列的前n项和,若S 2n-1=(2n-1)(2n+1) Sn等于? (求详细步骤)
已知等差数列An 满足a1+a(2n-1)=2n,设Sn是1/An的前n项和.记f(n)=S(2n)-Sn
若an是等差数列,则Sn,S2n-Sn,S3n-S2n,…也成等差数列,求公差
根据数列{an}的前n项和公式,判断下列数列是否是等差数列.(1)sn=2n^2-n (2)sn=2n^2-n+1
已知数列{an}为等差数列,且a1+a2n-1=2n,Sn为数列{[1an}的前n项和,设f(n)=S2n-Sn,
等差数列(an)中,Sn=30,S2n=100,则S3n= 为什么Sn S2n-Sn S
{An}为等差数列,且A1+A2n-1=2n,Sn为数列{1/An)的前n项的和,设f(n)=S2n-Sn
已知等差数列{an}满足 a1+a(2n-1)=2n设Sn是数列{1/an}的前n项和,记f(n)=S2n-Sn(n属于
Sn是数列{an}的前n项和,an=〔2n〕^2/(2n-1)(2n+1) 求Sn
数学请求帮忙等差数列的前n项的和为Sn,若S2n-1=(2n-1)(2n+1),则Sn等于?答案是n(n+2) 为什么?
1年前4个回答
已知数列{an}满足an=1/(2n-7)(2n-5),其前n项和为Sn 求证求数列{5/(10Sn+1)}
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