题目
题型:不详难度:来源:
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(1)求抛物线的方程
(2)试确定直线通道
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134932-51852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134931-58337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-82882.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-61493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-73567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-95110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-92078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-30862.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-75757.png)
再根据焦点坐标,可确定抛物线方程.
(2)设直线MN的方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-98398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-87689.png)
(1)依题意,设所求的抛物线方程为:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-75757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134935-62303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134935-76584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134935-84231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-61493.png)
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134935-39211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134936-56813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134932-51852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-98398.png)
联立
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134936-30035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-92620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134936-97428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134936-43634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134936-57906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134937-39207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134937-21243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134937-55958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-73567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-95110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134933-92078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134934-30862.png)
核心考点
试题【如图,某旅游区拟在公路(南北向)旁开发一个抛物线形的人工湖,湖沿岸上每一点到公路的距离与到处的距离相等,并在湖中建造一个三角形的游乐区,三个顶点都在湖沿岸上,直】;主要考察你对抛物线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/20191025/20191025134909-40756.gif)
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A.1 | B.![]() | C.![]() | D.-1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134853-95695.gif)
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A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134819-21325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134820-21054.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134820-55547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134820-15235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134808-29189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134808-89379.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134808-64525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134808-15441.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025134809-86687.gif)
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A. 2 | B. 3 | C. 4 | D. 6 |
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