19.数列{}满足递推式 (1)求a1.a2.a3,(2)若存在一个实数.使得为等差数列.求值; (3)求数列{}的前n项之和. 查看更多

 

题目列表(包括答案和解析)

(文科做)已知数列{an}满足递推式:an-an-1=2n-1,(n≥2,n∈N)且a1=1.
(1)求a2,a3;    
(2)求an;   
(3)若bn=(-1)nan,求数列{bn}的前n项之和Tn

查看答案和解析>>

(文科做)已知数列{an}满足递推式:an-an-1=2n-1,(n≥2,n∈N)且a1=1.
(1)求a2,a3;        
(2)求an;       
(3)若bn=(-1)nan,求数列{bn}的前n项之和Tn

查看答案和解析>>

(文科做)已知数列{an}满足递推式:an-an-1=2n-1,(n≥2,n∈N)且a1=1.
(1)求a2,a3;        
(2)求an;       
(3)若bn=(-1)nan,求数列{bn}的前n项之和Tn

查看答案和解析>>

(文科做)已知数列{an}满足递推式:an-an-1=2n-1,(n≥2,n∈N)且a1=1.
(1)求a2,a3;        
(2)求an;       
(3)若bn=(-1)nan,求数列{bn}的前n项之和Tn

查看答案和解析>>

(文科做)已知数列{an}满足递推式:an-an-1=2n-1,(n≥2,n∈N)且a1=1.
(1)求a2,a3;        
(2)求an;       
(3)若bn=(-1)nan,求数列{bn}的前n项之和Tn

查看答案和解析>>


同步练习册答案