题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185836-96009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185836-53935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185837-25961.png)
A.![]() | B.![]() | C.1 | D.![]() |
答案
解析
点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185837-61105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-72452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-48964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-58648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-82648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-62785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185839-59760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185839-96466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185839-96466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185839-39399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185838-82648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185839-88351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185840-92963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185840-24294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185840-45184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185840-26455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185841-21534.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185841-42698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185841-35430.png)
所以正确答案为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185841-77502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185842-29939.png)
核心考点
举一反三
已知椭圆焦点是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185828-78460.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185828-83658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185829-60153.gif)
(1)求椭圆的标准方程;
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185829-28921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185829-62164.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185829-30744.gif)
已知方向向量为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185824-63930.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185824-94230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185825-74950.gif)
求椭圆C的方程;
若已知点D(3,0),点M,N是椭圆C上不重合的两点,且
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185825-64847.gif)
求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185825-61458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185818-81543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185818-16575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185818-97817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185818-21888.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185819-27831.png)
A.2 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185812-79478.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185813-90780.gif)
是 ****** .
已知椭圆的焦点在
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185741-49044.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185742-31088.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185742-30207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185742-75022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185743-95491.gif)
(Ⅰ)求椭圆的标准方程;
(Ⅱ)设点M(m,0)是线段OF上的一个动点,且
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185743-55791.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023185743-36277.gif)
(Ⅲ)设点C是点A关于x轴的对称点,在x轴上是否存在一个定点N,使得C、B、N 三点共线?若存在,求出定点N的坐标,若不存在,请说明理由.
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