题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-94306.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-62548.png)
(Ⅱ)令函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-32976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-97584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-67333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-24522.png)
答案
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-62548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-67077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-32205.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-55216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-26247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
第二问中,
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-32976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-59869.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-37154.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-27542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-13091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-70615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-35196.png)
(Ⅰ)解:令
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-55216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-26247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-62548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-67077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-88351.png)
(Ⅱ)解:
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052612-32976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-59869.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-37154.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052614-27542.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-13091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-70615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-35196.png)
对称轴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-34864.png)
① 当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-17886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052615-75343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052616-27158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052616-45409.png)
② 当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052616-58060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052616-22518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052616-94693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052617-13964.png)
③ 当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052617-25312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052617-45805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052617-50032.png)
综上:
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052613-32205.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-14713.png)
(Ⅰ)若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-98821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-91527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-61332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-98821.png)
(Ⅱ)若对于
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052604-94385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052605-49741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052605-14934.png)
(Ⅲ)记
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052605-71291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052605-31128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052605-33084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052606-75957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052606-81816.png)
A.[√2,+∞) | B.[2,+∞) |
C.(0,2] | D.[-√2,-1]∪[√2,0] |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052557-46181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052558-69624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052558-57942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052558-10288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052558-17677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052558-78285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052559-90563.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052555-57689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052555-69637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052555-72564.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818052554-48321.png)
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