题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001320-42235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001320-94580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-81674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-58899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-70063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-53828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-97475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001321-70063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001322-51412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001322-80380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001322-65667.png)
答案
解析
试题分析:作点A关于直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001323-30409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001323-99056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001323-43153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001324-15691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001324-59501.png)
),此时离心率有最大值,当P离B,C越远时,离心率越小
点评:椭圆定义:椭圆上的点到两焦点的距离之和等于定值
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001323-43153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001323-43153.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001307-19663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001307-39703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001308-56336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001308-30049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001308-74433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001308-49207.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001307-19663.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001309-40050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001309-36625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001309-17942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001309-43445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001310-45483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001301-56529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001301-24675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001301-45139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001302-53570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001302-28369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001302-21240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001302-22236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001303-31860.png)
A.4 | B.8 | C.16 | D.32 |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001254-28466.png)
(1)已知在极坐标(与直角坐标系xOy取相同的长度单位,且以原点O为极点,以x轴正半轴为极轴)中,点P的极坐标为(4,
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001254-53380.png)
(2)设点Q是曲线C上的一个动点,求它到直线l的距离的最小值.
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001249-10238.png)
(1)若椭圆的长轴长为4,离心率为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001249-37997.png)
(2)在(1)的条件下,设过定点M(0,2)的直线l与椭圆C交于不同的两点A、B,且∠AOB为锐角(其中O为坐标原点),求直线l的斜率k的取值范围
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-62421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-43629.png)
①曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-43629.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-70228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-43629.png)
③若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-43629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-31395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-48970.png)
④若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001239-43629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001240-83691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001240-27461.png)
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