题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-27327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-30004.gif)
(1)令
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-72862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-28836.gif)
(2)求证:当
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-78406.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-43398.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-28836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-76234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-47767.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-78627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-92323.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-80146.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-48725.gif)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181706-32727.gif)
列表如下:
![]() | ![]() | 2 | ![]() |
![]() | ![]() | 0 | ![]() |
![]() | ![]() | 极小值![]() | ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-28836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-76234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181704-47767.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-78627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181705-92323.gif)
(Ⅱ)证明:由
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181707-90736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181703-28836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181707-72627.gif)
于是由上表知,对一切
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181708-20088.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181708-99069.gif)
从而当
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181708-33826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181708-88185.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181709-55186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181709-76299.gif)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181709-92138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181709-10270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181710-66422.gif)
故当
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181709-92138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181710-22585.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181611-64440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181611-39988.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181611-99138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181611-64440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181611-99846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181612-54893.gif)
A.8 | B.9 | C.10 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181554-10377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181554-13131.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181554-13131.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181548-99710.gif)
A.![]() | B.![]() ![]() | C.6 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-67232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-17676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-44816.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-10568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-83916.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181532-16423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-67232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181532-60286.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181532-92115.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181533-79943.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181533-82422.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-67232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181531-17676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181534-85053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181534-89644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181534-38368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181534-69386.gif)
A.1个![]() | B.2个![]() | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181518-65852.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181518-57704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205181518-17682.gif)
A.恒大于0 | B.恒等于0 | C.恒小于0 | D.符号不确定 |
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