题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111535-46257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111535-62357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111535-89458.png)
(1)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111535-89458.png)
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111536-50683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111535-89458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111536-93462.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111536-73356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111536-24211.png)
解析
试题分析:(1)由椭圆顶点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-49180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-50879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-27083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-51491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-50755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-17950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-40450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-20560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-19589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-36631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-78379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-32113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-76340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-15332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-72124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-67275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-23172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-32079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-40527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-10093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
(1)由已知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-50879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111542-69099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111542-99170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-17950.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-17950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-40450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111538-20560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-19589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111542-73494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111542-15357.png)
(2)椭圆右焦点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111543-61528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111543-62953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-32113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-76340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111537-49180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111543-56041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111543-54991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-15332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-72124.png)
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111540-67275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-23172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-40527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111543-36309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111541-10093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111539-44098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111536-24211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111544-70252.png)
核心考点
试题【已知椭圆的一个顶点为B(0,4),离心率, 直线交椭圆于M,N两点.(1)若直线的方程为y=x-4,求弦MN的长:(2)如果BMN的重心恰好为椭圆的右焦点F,求】;主要考察你对直线方程的概念与直线的斜率等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111522-23131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111522-98753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111522-79901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-74151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-69675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-33110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-20051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-37289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111524-13835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111524-90025.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111523-20051.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111524-72461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111524-25343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111525-73236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111525-63096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111525-46018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111525-64340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111525-90906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111526-99172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111526-84663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111516-39600.png)
A.![]() | B.-![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111512-67495.png)
A.-1 | B.-3 | C.0 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111507-55060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022111507-82843.png)
A.m>1,且n<1 | B.mn<0 |
C.m>0,且n<0 | D.m<0,且n<0 |
A.![]() |
B.![]() |
C.![]() ![]() |
D.![]() ![]() |
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