题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185942-28943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185942-31274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185942-54603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185942-79256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185942-29775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185943-74290.png)
A.2 | B.1 | C.![]() | D.![]() |
答案
解析
分析:由椭圆的定义可得 m+n="2a=2"
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185943-87599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-32797.png)
解答:解:由椭圆的方程可得 a=
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185943-87599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-12174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-29501.png)
由椭圆的定义可得 m+n=2a=2
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185943-87599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-12174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-12174.png)
由勾股定理可得(2c)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-60033.png)
∴△F
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-12174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-29501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185944-32797.png)
故选B.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185938-49223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185939-48203.png)
A.圆![]() | B.圆![]() |
C.圆![]() | D.以上三种情况都有可能 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185929-75860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185929-35934.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185929-15346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185923-10845.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
(1)已知圆的方程是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185913-36419.gif)
(2)若实数
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185913-64567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185913-25182.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185913-38403.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185914-92774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185902-73101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185902-38224.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185902-24255.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185902-73101.gif)
△
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185903-69397.gif)
(1)求椭圆C的离心率;(5分)
(2)求椭圆C的方程。(9分)
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