题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101108-84976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-98803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-83477.png)
(Ⅰ)求动点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-95938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-71162.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101110-56833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-71162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101110-81133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-71162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-98803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101110-55444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101110-88967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101110-55444.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101111-47799.png)
解析
试题分析:(Ⅰ)通过变换和分析可得点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-95938.png)
试题解析:(Ⅰ)由题知点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-95938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101111-89298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101111-88355.png)
所以点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101109-95938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101111-47799.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101111-90572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101112-92574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101112-81363.png)
由直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101112-83433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101112-52646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101112-49429.png)
同理∵
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101113-23880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101113-56511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101113-69668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101113-21044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101114-81383.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101114-17123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101114-84781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101114-70872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101115-59838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101115-76937.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101115-94164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101115-56324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101115-25718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101116-79140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101116-55128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101116-99195.png)
核心考点
试题【在直角坐标平面内,y轴右侧的一动点P到点的距离比它到轴的距离大(Ⅰ)求动点的轨迹的方程;(Ⅱ)设为曲线上的一个动点,点,在轴上,若为圆的外切三角形,求面积的最小】;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/20191024/20191024101103-19431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101104-23623.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101058-81064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101058-77312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101059-64169.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101051-59227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101051-50339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101051-29210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101051-50339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101052-17630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101052-80202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101052-37997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101040-71514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-37267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-10772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-37267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-31181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-62973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101041-41765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101032-54443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101032-69872.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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