题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064220-90756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064220-72377.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064220-90756.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064220-30990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064226-23613.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064226-11413.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064227-23220.png)
又有
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064227-33692.png)
解析
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064227-39633.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064228-91362.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064144-99502.png)
(1)求这个数列的通项公式;(2)设为其前n项和,求使取最大值时的n值。
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-58546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-88685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-58546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-96872.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064034-26973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064034-96541.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-58546.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064034-23558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064034-29596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-96872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064034-50833.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064035-77332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064035-58377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064033-96872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010064035-49369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063945-29665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063945-98695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063945-51462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063946-20896.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063839-51416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063839-73199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063839-77251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063840-83215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063840-73240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063840-61860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063840-58067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063841-63434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063841-73815.png)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063839-51416.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063841-59530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063842-71378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063842-22974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063842-88062.png)
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