题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092609-73838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092609-57473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092609-31261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092609-59589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-29506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-23656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-17396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-96982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-38312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-96497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-78941.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-70647.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-16048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-74315.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-70647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-90845.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-78903.png)
解:(1)依
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-29506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-23656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-17396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092610-96982.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-78903.png)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092613-99800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092613-43045.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-70647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092612-90845.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092611-78941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092613-25904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092613-41299.png)
得.
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092613-47416.png)
要证明
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092614-73633.png)
只需证
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092614-15640.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092614-40444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092614-21236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-14638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-75463.png)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-50476.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-69156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092616-36849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-69156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092616-78533.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092615-69156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092616-42994.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092616-84322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092616-99795.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092617-92584.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092601-40687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092601-26762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092601-83184.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092553-54030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092553-32037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092553-65187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092545-85297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092545-91478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092545-28731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092546-60469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092545-91478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092537-86036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092537-63218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092538-37167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092538-54892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092523-18492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092523-86277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-31609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-32988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-44155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-98435.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-47977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092524-44155.png)
(Ⅱ)求不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092525-37073.png)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092525-92393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014092525-57942.png)
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