题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-95855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-67579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-92186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-84636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-52860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-67579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-40853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-31809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-40853.png)
(2) 设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-91091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-95855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-92011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-97988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-15976.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-79597.png)
(2)存在最大的实数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-64700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-97988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-15976.png)
解析
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-84636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-52860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-67579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084752-40853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-31809.png)
(2)因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-91091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084751-95855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-92011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-97988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-15976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084755-24530.jpg)
所以存在最大的实数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-64700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084753-97988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084754-15976.png)
核心考点
试题【(本题满分15分)设数列的前项和为, 且. 设数列的前项和为,且. (1)求.(2) 设函数,对(1)中的数列,是否存在实数,使得当时,对任意恒成立】;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/20191012/20191012084724-12092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084724-49875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084725-62601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084725-52509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084725-61860.png)
A.![]() | B.![]() ![]() | C.![]() ![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-85343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-89529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-48781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-40541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084702-43737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084702-36372.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-85343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084702-29041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084655-40541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084702-36320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084702-36320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084649-25705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084650-48168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084650-50650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084650-68675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084650-65687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084650-68675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084651-70663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084651-88859.png)
A.1 | B.2 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084634-32600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084634-75293.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084619-98735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084620-34663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084630-27584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084630-44146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084631-87465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084631-37056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084620-34663.png)
A.12 | B.14 | C.16 | D.18 |
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