题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233538-92893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233539-46391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233539-98110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233539-68233.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233540-84169.png)
解析
试题分析:由椭圆的定义得,△
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233539-68233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233540-84169.png)
点评:简单题,涉及椭圆的焦点弦问题,往往要利用椭圆的定义。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233534-65965.png)
A.(0,2) | B.(0,-2) | C.(4,0) | D.(-4,0) |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233527-47879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233527-13784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233516-95588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233516-89786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233516-95588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233517-41613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233517-47902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233516-95588.png)
(1)写出抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233516-95588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233502-16498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233503-75302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233503-73218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233503-70222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233504-21374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233504-46257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233504-52481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-84608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233502-16498.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233502-16498.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233504-52481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-72435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-43499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-66258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233503-70222.png)
(3)试问
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-43499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233505-84608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233504-52481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-48345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-20919.png)
①曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-48345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233459-79452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-48345.png)
③若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-48345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233459-81886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233459-60848.png)
④若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233458-48345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233500-53623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233500-99907.png)
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