题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225748-55725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225748-17894.png)
A.![]() | B.3 | C.![]() | D.![]() |
答案
解析
试题分析:根据已知条件可知
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225749-14951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225750-73117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225750-82042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225750-52140.png)
点评:根据已知的解析式,要求接函数值,直接代入即可,因此该试题的关键是求解f(x)的解析式,进而代变量来求值,属于基础题,而求解析式一般用换元法来得到结论。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225711-85160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225711-51045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225713-24672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225713-24148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225714-57372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225715-41604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225715-55361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225715-54336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225716-41630.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225631-66866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225631-16016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225631-66866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225631-16057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225631-70895.png)
A.![]() | B.![]() | C.![]() | D.![]() |
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-84164.png)
(1)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-86274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-83425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-91951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-24785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-86274.png)
(2)若存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-86274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225614-83425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-91951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-24785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-94440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225615-78537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225616-59131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225556-63814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225557-34621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225557-92935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225534-77518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225535-74339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225535-56516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225535-84682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225536-33002.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225536-60149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225536-69112.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225536-82508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225537-72164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225537-82280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225537-78096.png)
(3)讨论关于
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225537-63292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204225538-30443.png)
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