题目
题型:黑龙江省模拟题难度:来源:
(1 )若
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083942-59275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083943-32890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083943-91640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083943-39401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083943-54957.png)
(2)若随机变量
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083944-14984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083944-99681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083944-34513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083944-52004.png)
(3)过平面外一点与该平面成
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083945-34045.png)
(4)点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083945-42966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083945-72988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083945-58094.png)
(5)在同一坐标系中函数
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083945-86223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083946-90943.png)
则正确命题的序号是( ).
答案
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083920-42159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024083921-53848.png)
B.y2=4x
C.y2=±8x
D.y2=8x
已知椭圆的离心率为
,直线
:
与以原点为圆心、以椭圆C1的短半轴长为半径的圆相切.
(1)求椭圆C1的方程;
(2)设椭圆C1的左焦点为F1,右焦点F2,直线l1过点F1且垂直于椭圆的长轴,动直线l2垂直l1于点P,线段PF2垂直平分线交l2于点M,求点M的轨迹C2的方程;
(3)当P不在x轴上时,在曲线C2上是否存在两个不同点C、D关于PF2对称,若存在,求出PF2的斜率范围,若不存在,说明理由。