题目
题型:不详难度:来源:
如图,椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184838-17823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184838-79963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-58663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-70194.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-83154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-90160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-83154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-27697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-25297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-15174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-72506.gif)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-67584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-33031.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-83154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-98562.gif)
(3)当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-25297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-58663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-73990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-67452.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-94883.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-80918.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-73990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-81564.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-80659.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184838-79963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-58663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-29982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-25587.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-59022.gif)
所以椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-67584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-94883.gif)
(2)由题意可得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-42144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-96837.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-76202.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-47176.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184843-56753.gif)
又因为点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184844-79747.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184844-94665.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184844-20722.gif)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184844-42963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184844-12488.gif)
则点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-83154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-80918.gif)
(3)由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184840-25297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184839-58663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184845-90685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184845-91626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184845-72683.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184845-73840.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184845-81787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184846-90380.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184846-89137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184846-86961.gif)
同理可得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184846-62886.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184847-56722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184847-19993.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-73990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184847-61449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184841-73990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184842-81564.gif)
核心考点
试题【(本小题满分14分)如图,椭圆 的离心率为,其两焦点分别为,是椭圆在第一象限弧上一点,并满足,过作倾斜角互补的两条直线分别交椭圆于两点. (1)求椭圆的方程】;主要考察你对椭圆的定义与方程等知识点的理解。[详细]
举一反三
已知椭圆方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184818-28593.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184818-60224.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184818-60233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184819-13644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184819-75810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184819-20628.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184819-20628.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184819-19330.gif)
(1)求满足条件的椭圆方程和抛物线方程;
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-92216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-92216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-96481.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-33273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-13141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184820-33273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184821-23736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184821-79956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184821-23736.gif)
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184812-21505.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184812-20282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184813-46238.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184813-97876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184813-48129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184813-26210.gif)
(Ⅱ)判断
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184813-70607.gif)
已知点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184756-37913.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184756-90572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184756-75260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184757-21926.gif)
(1)求曲线E的方程;
(2)过点Q(1,0)且斜率为k的直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184757-17759.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184757-72554.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184757-46063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184757-94413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184751-53685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184751-71740.gif)
|
|
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184751-36736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184752-54669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184752-12735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184752-29761.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184752-30357.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184745-44389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184745-46428.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184745-14660.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023184745-55385.gif)
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