题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093731-23346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093731-36125.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093731-60510.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-32540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093731-60510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-75282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-77839.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-37356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-75701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-31575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-74197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-42725.png)
解析
试题分析:(1)先求导,再讨论导数的正负得函数的单调区间。注意对
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-77839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-32540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093731-60510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-77839.png)
试题解析:解:(1)函数的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-80621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-68272.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-37356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-54834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-56841.png)
此时函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-17120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-75701.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-31575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-54834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093735-42014.png)
此时函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-17120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-74197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093735-18836.png)
(2)由(1)可知,当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-37356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-17120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093735-55932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-75701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093735-85625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093734-17120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093736-68651.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093732-77839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093733-42725.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-18717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-67694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-70629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-57361.png)
⑴求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-93988.png)
⑵若关于
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-15503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-17589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093713-43809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093714-25037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093658-14682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093658-73488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093659-34814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093658-73488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093658-14682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093658-73488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093659-70075.png)
A.1个 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093646-11218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093637-10649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093637-87661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093637-86308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093637-88665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093637-86308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093638-73126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093623-13994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-14411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-88249.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-55078.png)
(2)若对
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-26889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-90139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018093626-43689.png)
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