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共回答了16个问题采纳率:93.8% 举报
1年前
回答问题
设数列An的前n项和为Sn,已知a1=a,an+1=Sn+3n设Bn=Sn-3n次方,求数列Bn的通项公式
1年前3个回答
一道数列问题设数列{an}的前n项和为Sn.已知a1=a,an+1=Sn+3n,n∈N*.(1) 设bn=Sn-3n,求
1年前2个回答
数列{an}中,a1=2,an+1=4an-3n+1,求数列Sn,证明不等式Sn+1
设数列An的前n项和为Sn,已知a1=1,An+1=Sn+3n+1求证数列{An+3}是等比数列
已知数列{An}满足Sn=2An-3n,求A1和An
an=3n-2求a1,d,sn等差数列.
1年前1个回答
设数列{an}的前 项和为Sn.已知a1=a,an+1=Sn+3n,n∈N*
已知数列{an}的通向公式an=31-3n,求Sn=|a1|+|a2|+…+|an|
等差数列{an}中,若Sn=3n²+2n,则a1=?
设数列{an}的前n项和为sn.已知a1=a,an+1=sn-3n,n∈N*,设bn=sn-3n,且bn≠0
已知数列{an}的首项a1=a,Sn是数列{an}的前n项和,且满足:Sn2=3n2an+Sn-12,an≠0,n≥2,
已知数列{an}满足a1=x,a2=3x,Sn+1+Sn+Sn−1=3n2+2(n≥2,n∈N*),Sn是数列{an}的
已知数列{an}满足a1=x,a2=3x,Sn+1+Sn+Sn-1=3n2+2(n≥2,n∈N*),Sn是数列{an}的
已知数列a1=1,a(n+1)+an=3n+2,求an及Sn
已知数列{an}中a1=1,Sn=4an(下标)+3n(n∈N),求an
设数列{an}的前n项和为Sn.已知a1=a,an+1=Sn+3n,n∈N*.
已知数列{an}前n项和为Sn,a1=a,且满足an+1=Sn+3n,n∈N,
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