数列an.a1=1,a1+2a2+3a3+.+nan=(n+1)/2*an+1
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+2a2+3a3+…+nan=n(n+1)(n+2),则a1+a2+a3+…+an=多少?
若数列{an}满足a1+2a2+3a3+~~+nan=n(n+1)(2n+1),则an=
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
在数列{an}中,a1+2a2+3a3+.+nan=n(2n+1)(n属于N)
已知在数列{an}中,a1=1,nan+1=2(a1+a2+a3+...+an)(n∈N*)(1)求a2,a3,a4(2
数列an中,已知a1=1,a1+2a2+3a3+...+nan=2n-1,求数列an的通项公式
已知数列an满足a1+2a2+3a3+...+nan=n(n+1)*(n+2),则数列an的前n项和Sn=?
重点第三小题 已知在数列{an}中,a1=1,nan+1=2(a1+a2+a3+...+an)(n∈N*)(1)求a2,
已知数列{an}满足a1+2a2+3a3+...+nan=n(n+1)(2n+1),则该数列an=?
已知数列{an}满足:a1+2a2+3a3+...+nan=(2n-1)*3^n(n属于正整数)求数列{an}得通项公式