题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-56599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-61619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-88862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-76488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-98480.png)
(1)求动点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-12490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-95997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-12490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-39673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-20709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-36746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-39673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-20709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-86521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-35252.png)
解析
试题分析:(1)设动点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-91875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-65147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-41951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143851-36787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
试题解析:(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143851-71063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143851-98121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143851-52414.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-90242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-37494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-86521.png)
所以动点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143847-17696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-86521.png)
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-46812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-40678.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-39673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-20709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-74829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
∴直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-39673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143853-92823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-20709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143853-17199.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-36746.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143853-83548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143853-49422.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-48751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143848-79692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143852-74829.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143854-68818.png)
∴直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-39673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143854-91245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-20709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143854-38285.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143854-45306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143855-89725.png)
∴点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143849-54399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143850-35252.png)
核心考点
试题【已知点直线,为平面上的动点,过点作直线的垂线,垂足为,且.(1)求动点的轨迹方程;(2)、是轨迹上异于坐标原点的不同两点,轨迹在点、处的切线分别为、,且,、相交】;主要考察你对直线方程的几种形式等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143842-23603.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143836-83330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143836-90707.png)
A.1 | B.-1 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143830-11225.png)
A.(3,0) | B.(3,3) | C.(1,3) | D.(0,3) |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143823-38808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143823-85771.png)
(1)求边AC所在的直线方程;
(2)求AC边上的中线BD所在的直线的方程。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143818-47552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022143818-84801.png)
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