题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-51830.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-77095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-19000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-64741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-82921.png)
(2)试判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-53798.png)
解析
试题分析:(1)不等式恒成立问题,通常利用变量分离法转化为求最值问题. 由
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103837-84834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-18912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-64741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-38572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-16475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-94297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-60983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-53798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-51830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-78857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-98694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
[解] (1)由
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-68249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-18912.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-16475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103838-94297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-60983.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-53798.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103835-51830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-78857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103839-88660.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-36070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103836-41427.png)
核心考点
举一反三
已知
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103816-30822.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103817-77379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103817-19807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103817-56818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103818-21208.png)
(2)试证函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103818-34542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103818-86436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103746-57989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103747-16445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103747-45270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103747-10348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103747-70992.png)
A B C D
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103736-34466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103736-81914.png)
A.8 | B.9 | C.26 | D.27 |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-57626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-16727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-57626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-45744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-57626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103716-35812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103716-89554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103715-57626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103716-72977.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103717-68199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103717-64185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103717-87025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103717-86509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103612-16129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103612-37948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103613-67831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103613-90564.png)
①M={
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103613-80284.png)
②M={
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103613-42084.png)
③M={
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103614-30760.png)
④M={
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204103614-23582.png)
其中是“垂直对点集”的序号是 ;
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