题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-64942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-61522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-90829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-45547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-61522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213757-79863.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213758-45189.png)
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213757-79863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213756-61522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213758-81855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213757-79863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213759-38761.png)
故对称中心的点坐标为(
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213759-12763.png)
由中点坐标公式可得对称点的坐标为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213759-82500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213759-26070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213800-79163.png)
化简可得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213800-94211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213800-14787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213758-45189.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213740-49305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213740-72547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213741-17548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213741-20886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213741-98901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213741-77832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213742-95792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213742-11160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213742-68169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213740-72547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213742-41393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213743-64496.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213743-25420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213741-98901.png)
(2)试问
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213742-41393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213743-64496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213743-60106.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213729-80547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213729-17411.jpg)
(1)求椭圆E的方程;
(2)在椭圆E上是否存在关于直线l对称的相异两点?若存在,请找出;若不存在,说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213720-99233.png)
(1)求椭圆C的方程;
(2)设A,B是椭圆C上的两点,△AOB的面积为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213720-63354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213720-79207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213721-33039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213714-35916.png)
(1)求抛物线C的方程;
(2)是否存在点M,使得直线MQ与抛物线C相切于点M?若存在,求出点M的坐标;若不存在,说明理由.
(Ⅰ)求抛物线C的方程;
(Ⅱ)过F作直线交抛物线于A、B两点.若直线OA、OB分别交直线l:y=x﹣2于M、N两点,求|MN|的最小值.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213704-56059.png)
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