题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-10546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-85687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-74216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-95589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-95589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-85687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141534-37792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141534-27515.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-95589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141534-40486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141534-85003.gif)
(2)已知点A(m,2)在曲线C上,过点A作曲线C的两条弦AD,AE,且AD,AE的斜率k1、k2满足
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141535-61091.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141535-88228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141535-80536.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-91739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-44109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-50907.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-67426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141537-21918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141537-94864.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141537-87398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-22311.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-63739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-65789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-44109.gif)
所以动点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141535-88228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-39273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-91739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-44109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141539-21542.gif)
(2)将A(m,2)代入
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-44109.gif)
法一: ∵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141539-44712.gif)
设直线DE的方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141539-38566.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141539-69079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141540-43661.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141540-92531.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141540-42259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141540-13862.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141541-69535.gif)
将
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141540-92531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141541-42806.gif)
将b=k-2代入y=kx+b得y
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141541-89550.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141541-43752.gif)
将b=2-k代入y=kx+b
得y=kx
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-39273.gif)
∴直线DE过定点(-1,-2) …………………………………………13分
法二
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141542-38395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141542-27342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141542-61267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141542-68881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141543-12346.gif)
同理
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141538-39273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141543-22358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141543-57109.gif)
设直线DE的方程为x=ty+n代入
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-44109.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141544-82882.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141544-14098.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141544-91219.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141536-50907.gif)
核心考点
试题【(本小题满分13分)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)求动点的轨迹的方程;(2)已知点A(m,2)在曲线C上,过点A作曲线C的】;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/20191025/20191025141529-17224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-37724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-24047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-17224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-86225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-90269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141530-59491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-86225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141530-78975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141530-75525.png)
(1)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-86225.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141530-87483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141531-45646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141531-95291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141531-66430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141531-38558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-61471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-90269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-61471.png)
(3)分别过
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-90269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141530-59491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141529-86225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-63396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-63396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-72733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141532-15641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141533-11184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141501-41159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-18661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-75226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-76412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-97132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141503-50124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-97132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141503-50124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141503-10714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141502-75226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141503-80704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141436-14620.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141437-46916.gif)
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A.![]() | B.8 | C.![]() | D.16 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025141359-76040.png)
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