11.设数列 满足 ,( ),记 ,
11.设数列 满足 ,( ),记 ,
设数列{ Xn}满足0
设数列{Xn}、{Yn}、{Zn}满足Xn
设数列{an}是首项为1000,公比为十分之一的等比数列,数列{bn}满足
设数列an=n3+Xn(n属于N),且满足a1
设数列满足a1=2,an+1-an=3•22n-1
设数列{an}满足:a1=1,an+1=3an,n∈N+.
设数列an满足a1=2 an+1-an=3-2^2n-1
设数列{an}满足:存在正数M,对一切n有
设数列{Xn}满足x1=10,lgXn+1=1+lgXn,求通项Xn.
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
设数列AN满足A1+3A2+3^2A3+...+3^N-IAN=N/3,