错位相减法求和设数列满足a1+3a2+3∧(2)×a3…3^(n-1)an=n/31.求an通项2.设bn=n/an 求
错位相减法求和设数列满足a1+3a2+3∧(2)×a3…3^(n-1)an=n/31.求an通项2.设bn=n/an 求
设数列an满足a1+3a2+3^2a3+……+3^(n-1)an=n/3,a是正整数,设bn=n/an,求数列bn的前n
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+2a2+3a3+.+nan=2^n(n属于N*)求数列an的通项公式 设bn=n^2an,求数列bn
设数列an满足a1+3a2+3^2a3+.+3^n-1an=n/3,n∈N*,求数列an的通项公式
数列{an}满足a1+3a2+3^2a3+……3^n-1an=n/3,【1】求{an}通项公式 【2】设bn=n/an,
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
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
设数列{an}满足a1+3a2+3²a3+...+3^(n-1)an=n/3,n∈N+*.(1)求数列{an}
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?
设数列{an}满足a1+3a2+3^2a3+...+3^n-1an=n/3,求(1)数列{an}的通项公式(2)设bn=
设数列{An}满足A1+3A2+3²A3+…+3n-1An=3/n.(1)求数列{An}的通项.