题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191350-68988.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191350-15740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191350-94673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-76278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-34739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-43918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-26141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-74597.gif)
(1)求椭圆的离心率;
(2)若椭圆的焦点关于直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-36670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191352-47822.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191352-50922.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191352-60507.gif)
解析
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-26141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-34739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-43918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191350-94673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-76278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191352-39350.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-94534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-99185.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-25865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-46200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-56027.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-34739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-36670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-28798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191353-53172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191354-82088.gif)
(2)由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191354-22465.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191354-71663.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191354-71663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191351-74597.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191354-48803.gif)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-28327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-28530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-48577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-52958.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-16003.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191355-20008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191352-60507.gif)
核心考点
试题【(本题满分14分)已知直线与椭圆相交于、两点,是线段上的一点,,且点M在直线上(1)求椭圆的离心率;(2)若椭圆的焦点关于直线的对称点在单位圆上,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
设椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191333-36026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191333-88022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191333-92573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-49264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-55746.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-88145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-45645.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-97410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-65832.gif)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-55746.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-31041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191334-55746.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-31041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-61485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-14010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-77304.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-61228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-91303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191336-94560.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191335-61485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191323-39633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191323-50486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191324-81543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191324-72924.gif)
A.必要不充分 | B.充分不必要 | C.充要 | D.既不充分又不必要 |
①用画图工具在工作区画一个大小适中的图C;
②用取点工具分别在圆C上和圆C外各取一个点A,B;
③用构造菜单下对应命令作出线段AB的垂直平分线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191318-31830.gif)
④作出直线AC。
设直线AC与直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191318-31830.gif)
A、椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191318-18463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191311-16972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191312-36060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191312-93666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191312-28491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191313-66715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023191313-15862.gif)
A.(![]() | B. [![]() | C. (![]() | D.[![]() |
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