题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173043-69503.png)
(I)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173043-25043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-12510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-58100.png)
(II)是否存在正实数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-96886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-28299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-87660.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-23621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-48524.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173043-25043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-45211.png)
(2)集合
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-28299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-14997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-75342.png)
解:(I)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173046-80494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173044-12510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173046-74870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-45211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173046-93807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173046-33122.png)
(II)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173046-92530.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173047-31762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173047-89789.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173047-86291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173047-91038.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173047-39695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173048-90898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173048-49101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173048-45521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173048-78136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173048-98334.png)
记
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173049-88728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173049-17804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173045-48524.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173040-72200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173041-82903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173041-32648.png)
___________________________.
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173038-61679.png)
A.y=![]() | B.y=![]() | C.y=xex | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173034-86596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173035-28932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173032-95955.png)
①f(x)在[1,3]上的图像是连续不断的;
②f(x)在[1,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173032-19358.png)
③若f(x)在x=2处取得最大值1,则f(x)=1,x∈[1,3];
④对任意x1,x2,x3,x4∈[1,3],有
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173032-38895.png)
其中真命题的序号是
A.①② | B.①③ | C.②④ | D.③④ |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173027-93569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817173028-11474.png)
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