题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213035-11145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213035-80484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213035-50883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213035-60392.png)
答案
解析
试题分析:由题意可得,a=2,又∵e=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213036-97972.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213027-53053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213027-79187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213028-27063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213028-21092.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213028-19316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213014-77118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-34914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-95828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-70882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-93855.png)
(1)若圆
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-70882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213016-73335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-70882.png)
(2)写出一个定圆的方程,使得无论点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-95828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213015-70882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213016-21606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213005-64676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213006-82891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213006-16503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213006-72994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213006-20288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213007-89285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025213007-41668.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025212959-55391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025212959-84728.png)
△ PAB的面积等于3,则这样的点P共有( )
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025212948-91484.png)
(1)求出轨迹C的方程,并讨论曲线C的形状;
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025212948-65982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025212949-91417.png)
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