题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021327-96541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021327-88535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021327-53351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-19715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-47868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-60009.png)
(Ⅰ)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-54922.png)
(Ⅱ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-88610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-61874.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-50829.png)
解析
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-63710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021327-53351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-19715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-47868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-60009.png)
得到参数a,b的值。
(2)根据第一问的结论,然后由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021330-22831.png)
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-63710.png)
由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021330-65379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-50829.png)
(2)由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021330-98708.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021330-72680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021330-81351.png)
列表如下:
![]() | -3 | (-3,-2) | -2 | (-2,1) | 1 | (1,3) | 3 |
![]() | | + | 0 | - | 0 | + | |
![]() | 10 | 增 | 极大值21 | 减 | 极小值-6 | 增 | 46 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021328-47868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-88610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021331-20914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021329-88610.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021315-71099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-31860.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-56405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-17725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-98064.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-17725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-82810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021316-98064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021310-94012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021310-97186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021306-76986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021306-28522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021306-12212.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021255-98287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021256-72392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021256-17419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021256-29839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021256-62116.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021256-65087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021255-98287.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021257-61793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021257-15817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021247-25910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021247-31342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021247-69287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021247-97128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019021248-93318.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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