题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-93135.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-12586.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-59629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-84168.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-73331.gif)
(Ⅰ)求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-80663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-12800.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-12800.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-66398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-80663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-67365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-94819.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-12967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-86136.jpg)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-30475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-22314.gif)
(Ⅱ)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-53230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-94196.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-67826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-69905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-29454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182433-30475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-29454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-29232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182432-59629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-62492.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-70921.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-32923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-76007.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-98704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-38705.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182435-92121.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182434-67826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182436-82683.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182436-93076.gif)
核心考点
试题【(本题满分15分)过轴上的动点,引抛物线两条切线,为切点。(Ⅰ)求证:直线过定点,并求出定点坐标;(Ⅱ)若,设弦的中点为,试求的最小值(为坐标原点).】;主要考察你对抛物线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/20191025/20191025182426-41186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182426-44487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182426-55248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182426-44487.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-34952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-10472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-96610.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-48796.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-65565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-65206.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-96610.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182422-74056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182423-90344.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182423-40389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182415-52782.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182415-92035.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182359-17982.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182338-95822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182338-56684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182338-81847.gif)
(Ⅰ)求由抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182338-95822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025182338-56684.gif)
(Ⅱ)求使⊿PAB的面积为最大时P点的坐标。
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