题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-29684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-72922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
(Ⅰ)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
(Ⅱ)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-63112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-39181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-37384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-41994.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-39181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-63112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-86109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-40633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-12671.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-23237.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-88034.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-23237.gif)
解析
(I) 由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-55819.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-88034.gif)
(II)不妨设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-54381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195832-39181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-22507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-32202.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-78426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-14053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195831-33669.gif)
所以有
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-79247.gif)
设线段MN的中点的横坐标是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-91148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-37230.gif)
设线段PA的中点的横坐标是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-49326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195835-98527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195835-11856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195835-71888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195835-39520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195836-80172.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195836-80172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195836-65658.gif)
因此不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195834-79247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195836-36699.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195836-69725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195835-71888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195837-97593.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195837-60369.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195837-89410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195833-23237.gif)
核心考点
试题【已知椭圆:的右顶点为,过的焦点且垂直长轴的弦长为1.(Ⅰ)求椭圆的方程;(Ⅱ)设点在抛物线:上,在点处的切线与交于点.线段的中点与的中点的横坐标相等时,求的最小】;主要考察你对椭圆的定义与方程等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195816-71563.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-12109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-37034.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-35544.gif)
(1)求椭圆C的方程;
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-35544.gif)
(3)是否存过点P的直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-11399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195817-54443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-98058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-28410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-51962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-87810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-45732.gif)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-87810.gif)
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-38594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-90318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195807-90495.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-90318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195805-87810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195807-33778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195807-33778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-90318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195806-38594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195757-85342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195757-52572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195757-90883.gif)
斜角为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195757-48966.gif)
(Ⅰ)求椭圆M的方程;
(2)设过右焦点F且与直线AB垂直的直线交椭圆M于C,D,求|AB| + |CD|的最小
值。
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195751-33219.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195752-38363.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195752-43751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195752-72956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195745-82325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195745-89993.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195745-82464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195745-57468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023195745-71321.gif)
⑴求椭圆的标准方程。
⑵如图,过焦点F2作两条互相垂直的弦AB,CD,设弦AB,CD的中点分别为M,N。
①线段MN是否恒过一个定点?如果经过定点,试求出它的坐标,如果不经过定点,试说明理由;
②求分别以AB,CD为直径的两圆公共弦中点的轨迹方程。
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