题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104648-31279.png)
答案
解析
由
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104648-48540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104648-28937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104649-81429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104649-66975.png)
同理kPB=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104649-38440.png)
由于PA与PB的斜率存在且倾斜角互补,
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104649-66975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104649-38440.png)
那么
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104648-31279.png)
核心考点
试题【过抛物线y2=2px(p>0)上一定点P(x0,y0)(y0>0)作两直线分别交抛物线于A(x1,y1),B(x2,y2),当PA与PB的斜率存在且】;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/20191025/20191025104625-48424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104626-71566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104626-17047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104626-63424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104626-15472.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104627-96554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104556-24799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104556-19184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104556-99772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104557-18263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104557-52554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104557-78478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104557-87016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104558-11126.png)
A.y2=4x或y2=8x | B.y2=2x或y2=8x |
C.y2=4x或y2=16x | D.y2=2x或y2=16x |
A.1 | B.3 | C.-4 | D.-8 |
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104512-45005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104512-17709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104513-10241.png)
(1). 求
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104512-17709.png)
(2). 若点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104513-63428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104513-60806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104513-19793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104514-22187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104514-52537.png)
求点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104513-19793.png)
(3). 试研究: 是否存在一条边所在直线的斜率为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104514-72560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104514-54829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025104514-54829.png)
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