题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045549-57041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045549-31542.png)
(1)求动圆圆心
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-34129.png)
(2)直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-79808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-64805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-73581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-25785.png)
(3)求(2)中△OPQ的面积(O为坐标原点).
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-65817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-12047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-35323.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045549-57041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045549-31542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045552-13511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045552-57812.png)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045552-81457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-34129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045552-36854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045552-36854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-65817.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045553-96641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045553-57052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045553-81909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045553-81482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045554-27775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045554-13395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045551-12047.png)
(3)由(2)知:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045554-80150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045554-32379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045550-79808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045555-72139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045555-40794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045555-98036.png)
核心考点
试题【(本题满分12分)已知一动圆与圆外切,同时与圆内切.(1)求动圆圆心的轨迹方程,并说明它是什么样的曲线;(2)直线与M的轨迹相交于不同的两点、,求的中点的坐标;】;主要考察你对常见曲线的参数方程等知识点的理解。[详细]
举一反三
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045543-87075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045543-21118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045543-13962.png)
(1)求圆心C的直角坐标;
(2)由直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045543-87075.png)
已知曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045534-40441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045534-90254.png)
(1)将
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045534-87592.png)
(2)若点
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045535-36569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045534-87592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045535-36624.png)
A.线段或圆的一部分 | B.椭圆的一部分 |
C.双曲线的一部分 | D.抛物线的一部分 |
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045505-98464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045505-22720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045506-38410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045506-39090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045506-51217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045506-39090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045506-56358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045507-19874.png)
(1)求k的取值范围;
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045507-29744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045456-35030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045456-82115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045456-20497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108045457-57501.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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