已知数例{An}满足a1=1,a2=2,A(n+2)=2An+A(n+1)
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
已知数列{an}满足a1=1;an=a1+2a2+3a3+...+(n-1)a(n-1);
设数列{an}满足a1+3a2+3^2a3+.3^n-1×an=n/3,a∈N+.
数列an满足a1=2,a2=5,a(n+2)=3a(n+1)-2an
已知数列{an}满足a1=1,a2=3,a(n+2)=3a(n+1)-2an
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
数列{an} {bn}满足:a1=0 a2=1 a(n+2)=[an+a(n+1)]/2 bn=a(n+1)-an 求证
一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An
设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数.
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
已知数列{an}满足a1=1,a1+a2+a3+.+a(n-1)-an=-1(n≥2且n属于N+).