题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125514-92173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-14016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-37838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-38971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-84681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-64172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-37838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-42243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-14825.jpg)
(1)用
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-14122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-38971.gif)
(2)用
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-14122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-27605.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-64172.gif)
(3)当实数
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-27605.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-34364.gif)
并求此时
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-54119.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-61333.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-75820.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-86785.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-48562.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-61333.gif)
代入
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-11853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-53652.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-49718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-52722.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-51413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-84837.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-51413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125518-13293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125518-15382.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-84837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125518-80842.gif)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125518-37111.gif)
综上,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125517-84837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-64172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-75820.gif)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125518-17564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125519-98426.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-34364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125519-72712.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125519-75342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125519-99365.gif)
故当实数
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125519-99365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125515-34364.gif)
此时
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125520-64885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125520-79358.gif)
易得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125520-37203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125520-93857.gif)
此时
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-54119.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125516-86785.gif)
核心考点
试题【如图,,过曲线上一点的切线,与曲线也相切于点,记点的横坐标为。(1)用表示切线的方程;(2)用表示的值和点的坐标;(3)当实数取何值时,?并求此时所在直线的方程】;主要考察你对直线的倾斜角与斜率等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125504-22147.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125504-97204.jpg)
(I)求椭圆的方程;
(II)若C、D分别是椭圆长轴的左、右端点,动点M满足
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125504-20138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125504-55241.gif)
(III)在(II)的条件下,试问在x轴上是否存在异于点C的定点Q,使以线段MP为直径的圆恒过直线DP、MQ的交点,若存在,求出Q的坐标,若不存在,说明理由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125504-27139.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125505-52276.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125459-49827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125500-68871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022125453-38364.png)
A.任意梯形 | B.任意四边形 | C.平行四边形 | D.直角梯形 |
A.两条直线 | B.一个三角形 | C.一个点与直线 | D.三个点 |
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