题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131341-40877.png)
(1)求点P的坐标;
(2)焦点在x轴上的椭圆C过点P,且与直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131341-55585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131341-34715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-83425.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-60112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-93710.png)
解析
试题分析:(1)首先设切点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-85387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-13575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-27865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-11432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-91145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-82727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-36444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-32685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131345-60513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131341-34715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131345-41967.png)
(1)设切点坐标为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-85387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-13575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131345-77694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131345-48181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-11432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131343-91145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-82727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-13940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-91949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-81886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-60112.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-77568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-36444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-27660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-77568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131344-32685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-10534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131347-91803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131347-87028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131347-70368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131347-85599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131347-79083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131348-64273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131348-26476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131348-34668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131348-88988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-99901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-84781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-82699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-84781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-12492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131349-70168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131350-86274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131346-77568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131342-93710.png)
核心考点
试题【圆的切线与x轴正半轴,y轴正半轴围成一个三角形,当该三角形面积最小时,切点为P(如图).(1)求点P的坐标;(2)焦点在x轴上的椭圆C过点P,且与直线交于A,B】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131327-70850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131327-41264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-41007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-49996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-88277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-19525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-80983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-49996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131329-71995.png)
(1)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131329-13985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131329-20228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131328-49996.png)
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131329-13985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131329-22297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131330-95125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131330-16481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131330-99374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131318-22562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131318-79233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-76815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-57998.png)
(1)求椭圆的离心率;
(2)设P为椭圆上异于其顶点的一点,以线段PB为直径的圆经过点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-55275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-62294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-51321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-31532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131319-99713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-83865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-96893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-99859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-83749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131311-36797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-96893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-83749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131311-79613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131310-83749.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131306-70641.png)
已知点A
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131250-59206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131250-77603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131250-62506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131251-29057.png)
(I)求E的方程;
(II)设过点A的动直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131251-75453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131251-67606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023131251-75453.png)
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