题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015336-60177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015336-58698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015336-27446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-47005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-53027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-55383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-29641.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-93367.png)
解析
试题分析:依题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015338-33331.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015338-70996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015338-68749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015338-25864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015339-82477.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015339-85935.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015339-34834.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015339-28572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015339-36781.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-16018.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-10799.png)
故它在闭区间上的最小值必在端点处取得,
又
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-54163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-18009.png)
整理得
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-24805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015340-10799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015341-31027.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015341-11547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-29641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015337-93367.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015325-38479.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015325-60455.png)
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015325-39347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015326-97414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015326-84077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-58318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015316-71112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015316-70357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015316-45547.png)
①函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015316-43458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-56682.png)
②函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-95664.png)
③如果当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-44212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015315-27567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-27513.png)
④当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-42454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015318-39513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015317-56682.png)
其中正确命题的序号是 .
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015310-79393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015310-84757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015310-96348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015300-74081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015300-71316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015300-45328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015300-34083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015300-35433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015301-96806.png)
A.![]() | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015254-31831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015254-71161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019015255-81536.png)
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