题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-41805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-63844.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-51110.png)
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-79459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-78519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-34465.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-24462.png)
解析
试题分析:(1)因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-41805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-63844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-63844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-51110.png)
(2)因为不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-79459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-78519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-78519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135922-78519.png)
试题解析:(1)解:因为
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-76324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-19730.png)
因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-76324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-87802.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-24262.png)
(2)解:由(1)知,
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-16764.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-45241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-87030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-96347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-87030.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-69951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-52842.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-87030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-57837.png)
所以函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-69951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135924-87030.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135925-15123.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135923-24462.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135817-10046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135818-79311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135818-92624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135818-92089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135818-25347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135819-87833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135819-12912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135819-39284.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135754-30126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135754-56896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135754-43042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135754-51596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135755-23376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135755-40390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135755-40824.png)
A.有最小值![]() | B.有最大值1,无最小值 |
C.有最小值![]() | D.有最大值![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135747-36813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135747-71498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135712-91600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135712-88810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135712-87154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135712-38159.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135655-51877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135655-15083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135655-99186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204135655-53475.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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