题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090615-38832.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090615-38832.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-25178.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-88054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-99897.png)
解析
试题分析:(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090615-38832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-58446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-58446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-23984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-24668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-80883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-89145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-36437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-24630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-50809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-49284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-67894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-55863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090615-38832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-95770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-26215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-89510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-26215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-51595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-58873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-69032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-49035.png)
试题解析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-73659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-58446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-23984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-24668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090621-62064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090621-75404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-80883.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090617-89145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-49284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090618-67894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-55863.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-88054.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-95770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090621-52662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090621-23056.png)
可得
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090622-26426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-26215.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090619-89510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-58873.png)
由Tn>2m,可得
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090620-69032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090616-99897.png)
核心考点
试题【已知函数f(x)=x2-(a-1)x-b-1,当x∈[b, a]时,函数f(x)的图像关于y轴对称,数列的前n项和为Sn,且Sn=f(n).(Ⅰ)求数列的通项公】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-31679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-21218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-39807.png)
(I)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-31679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-39807.png)
(Ⅱ)设数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090557-56054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090558-72970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090558-58282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090521-55247.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090522-13107.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090522-32508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090522-71526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090340-64675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090340-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090340-83613.png)
A.50 | B.45 | C.55 | D.40 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-44687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-99022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-76325.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-44687.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-44687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-98829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090259-54451.png)
(3)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090259-90005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090258-98829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090259-84289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090216-89384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090216-84887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090217-15582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009090217-19673.png)
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