设数列{a}满足a1=2,a2=5,an+2=3an+1-2an一求证数列{an+1-an}是等比数列二求数列{an}的通项公式an三求数列{an}的前n项和Sn
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/10 11:22:56
x){n߳vLN}{m
mtlMulQbޓ
66XSO̫}6cO?TWS|VˆY/|ں~9
vTL γI*'U`D:
&w~`
<
CMD
@&
1]P~4T.1/H!z444t
fkO724*jlʹ
5,"mjt"5yƺ0..H̳5 EH
设数列{an}满足:a1+a2/2+a3/3+a4/4……+an/n=An+B,其中A、B为常数.数列{an}是否为等差数列?
设数列AN满足A1等于1,3(A1+a2+~+AN)=(n+2)an,求通向公式
设数列{an}满足;a1+a2/2+a3/3+...+an/n=n^2-2n-2,求数列{an}的通项公式(a1,a2,a3...an中a后面都是下标)
设数列{an}满足lg(1+a1+a2+...+an)=n+1,求通项公式an
已知数列{an}满足条件:a1=5,an=a1+a2+...a(n-1) n大于等于2,求数列{an}的通项公式
数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an
设数列an满足a1=1,a2=4,a3=9,an=a(n-1)+a(n-2)-a(n-3).则a2011=
已知数列满足a1=1/2,an+1=2an/(an+1),求a1,a2已知数列满足a1=1/2,a(n+1)=2an/(an+1),求a1,a2;证明0
已知数列{an}满足对任意的正整数n,都有an>0,且a1^3+a2^3+..an^3=(a1+a2..an)^2,设数列{1/an*an+2}设数列{1/an*an+2}的前n项和为Sn,不等式Sn>1/3loga(1-a)对于任意正整数n恒成立,求实数a的取值范围
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)求通项an
数列an满足a1=2,a2=5,a(n+2)=3a(n+1)-2an,求数列{an}的通项公式
设数列{an}满足:存在正数M,对一切n有An=|a2-a1|+|a3-a2|+-----+|an-a(n-1)|
设数列【an】满足a1=1,3(a1+a2+a3+······+an)=(n+2)an,求通项an
设数列{a}满足a1=2,a2=5,an+2=3an+1-2an一求证数列{an+1-an}是等比数列二求数列{an}的通项公式an三求数列{an}的前n项和Sn
设数列an满足a1+2a2+3a3+.+nan=2^n 1求数列a的通项 2设bn=n^2an 求数列的前n项和Sn求大神帮助
问道数列题.设数列an满足a1+2a2+3a3+...+nan=2^n(n属于正自然数),则数列an的通项是?
已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1)
设数列{an}满足Sn=n^2+1,Pn=1/a1.a2+1/a2.a3+.+1/an.an+1,求n=?