题目
题型:解答题难度:简单来源:不详
已知定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-66522.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-14395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-83753.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-36857.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-14395.gif)
(2)证明方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-56860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-95460.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-85331.gif)
(2)方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-56860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-95460.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-66666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-19365.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011830-51921.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011828-14395.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011830-10412.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-85331.gif)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011830-51236.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011830-71630.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011831-30387.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011831-30947.gif)
∴方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-56860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011829-95460.gif)
核心考点
举一反三
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011821-47830.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011821-84025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011821-99617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011822-67525.gif)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011821-99617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011822-24491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011822-25232.gif)
定义在
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011814-49771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011814-82362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011814-60817.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011815-20036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011815-19513.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011815-18505.gif)
(2)证明
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011814-82362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011814-49771.gif)
(3)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011815-55158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011815-36602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011816-82078.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-24233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-92500.gif)
那么称
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-93771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-38667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-93771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011812-17044.gif)
函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011813-43801.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011808-70638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011809-18020.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011804-17657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011804-26510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011804-23936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818011804-79898.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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