题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-55258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-32424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-86398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-69021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-81974.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-51395.png)
(Ⅲ)a的取值范围是
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-83869.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-86486.png)
(II)求导后
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-70811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-50971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-32827.png)
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-22117.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-75974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-81974.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-70811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-31689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052411-50971.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-34311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-57697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-47351.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-14500.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-94640.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052413-20936.png)
(Ⅲ)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-34311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052413-18553.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052412-14500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052413-88539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052413-94323.png)
综上可知,若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052409-94546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052410-83869.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052405-82038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052405-95041.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052404-55046.png)
A.1 | B.3 | C.![]() | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052401-67120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052401-89687.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052401-68464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052401-60896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052350-68587.png)
(I)设
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052351-61919.png)
(II)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052351-73035.png)
(III)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052351-39993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052347-76298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052347-25393.png)
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