数列{An}满足A1+3A2+3^2*A3+.+3^N-1*An=n/3 A属于N
设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数.
设数列{an}满足a1+3 a2+3^2 a3+……+3^n-1 an=n/3,a属于N* 求数列{an}的通项
设数列{an}满足a1+3a2+3^2a3+.3^n-1×an=n/3,a∈N+.
数列{an}满足:1/a1+2/a2+3/a3+…+n/an=2n
数列an满足a1+2a2+3a3+...+nan=(n+1)(n+2) 求通项an
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
已知数列{an}满足a1=1;an=a1+2a2+3a3+...+(n-1)a(n-1);
整数数列{An}满足 A1*A2+A2*A3+…+A(n-1)*An=(n-1)*n*(n+1)/3 ,(n=2,3,…
已知数列{an}满足a1=1,an=a1 +1/2a2 +1/3a3 … +1/(n-1)a(n-1),(n>1,n∈N
设数列{an}满足a1+3a2+3平方a3+...+3n-1an=n/3,n属于N*.求数列{an}的通项公式?
已知数列An满足A1=1,An=3^(n-1)+A(n-1)(n=>2).(1)求A2,A3;(2)证明An(3^n-1
设数列{an}满足a1+3*a2+3^2*a3+......+3^(n-1)*an=3/n,n属于正整数。 (1)求数列