题目
题型:不详难度:来源:
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090240-59022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-30201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-57530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-10764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-93774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-20036.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090240-59022.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-36278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-30201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-80931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-39369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-30201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-80931.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-65880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-84793.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-58160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-46196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-80570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090240-59022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-58160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090244-40145.png)
(2)求出
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090255-34686.png)
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-10764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090255-22066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090255-88076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090255-91300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-58160.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090256-44145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090241-10764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-46196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-80570.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090256-59379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-58160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090244-40145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090242-65880.png)
(2)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090256-98711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090256-77667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090256-44578.png)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090257-40169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090257-13157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090257-20818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090258-66103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090243-84793.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090223-25096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-30997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-40896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-16078.png)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-20829.png)
(II)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-30997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-60362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-37122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-33144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-12720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-57493.png)
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-85261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-61510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-76345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-32116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-70081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-85201.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-85261.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-82651.png)
(3)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-16950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-76552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-94452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090203-23522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-85201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-16950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-54850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-47716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-97855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090137-97251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090143-82780.jpg)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090123-66024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-92242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-33895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-23920.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-91308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-16521.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-81324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-51415.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-20321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-28623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-88311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-28623.png)
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