题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155902-15134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155902-80695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-54390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-66757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-96284.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-12317.png)
A.![]() | B.![]() | C.2 | D.3 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155902-15134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155902-80695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-54390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-66757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-96284.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155903-12317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155904-31840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155904-17831.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155852-59705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-57983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-28163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-64392.jpg)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-63991.png)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-81499.png)
设D为椭圆m与y轴负半轴的交点,且
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155853-97406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155844-92157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155845-60020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155845-86946.jpg)
(1)为增加景观效果,拟在水池内选定两点安装水雾喷射口,要求椭圆上各点到这两点距离之和都相等,请指出水雾喷射口的位置(用坐标表示),并求椭圆的方程。
(2)为了增加水池的观赏性,拟划出一个以椭圆的长轴顶点A、短轴顶点B及椭圆上某点M构成的三角形区域进行夜景灯光布置,请确定点M的位置,使此三角形区域面积最大。
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155837-13847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155837-76761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155837-57752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155837-77490.png)
(1)求椭圆的方程
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155838-16016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155838-55390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155838-92678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155838-86001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155839-51885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155839-15944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155839-40355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155839-15944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155839-15944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155831-55755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155831-37757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155831-32665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155831-27301.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155832-15448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155832-37292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155832-47883.png)
A.![]() | B.![]() | C.![]() | D.![]() |
如图,抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155816-15544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155816-42523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155816-50794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-83199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-12606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-15668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-76892.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-49942.png)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155818-89588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155818-49825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155818-36742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155818-81232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155819-18626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155817-49942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155819-71019.png)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155819-78696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155819-32846.png)
(II)记
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155819-94164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155820-97554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155818-49825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023155820-43332.png)
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