题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154411-67442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154412-23308.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154411-67442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154413-53973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154413-45439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154413-95911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154414-39963.png)
直线AB的方程为y=x-1 ,代入
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154411-67442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154414-60561.png)
所以由弦长公式得|AB|=
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154414-38579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154412-46854.png)
点评:基础题,利用数形结合思想,通过确定弦的方程,进一步转化成代数问题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154358-39754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154358-34548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154358-37830.png)
A.![]() | B.![]() | C.![]() | D.![]() |
如果两个椭圆的离心率相等,那么就称这两个椭圆相似.已知椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-17042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-79640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-17042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-33757.png)
(Ⅰ)试求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-17042.png)
(Ⅱ)设椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-54418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154345-60731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-17042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154345-55674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-54418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154345-97760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154345-86793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154345-65839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-17042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154344-54418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154337-18043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154329-20752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154329-81530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154329-86358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154330-26683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154330-39848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154319-14754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154319-76655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-67722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-75457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-75457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-64586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-88391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-33455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-88590.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154319-14754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154320-75457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-33455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-48085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-91970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154321-78768.png)
求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023154319-14754.png)
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