题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152457-70286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152457-65121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152457-70286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152457-25427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-63391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-21986.png)
(1)当点B与点D重合时,求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-63391.png)
(2)设△BCD的面积为S,当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-63391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-79040.png)
(3)连接MB,当MB∥OA时,如果抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-79159.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-97519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-18515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-73834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-44579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-68798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-19412.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-97024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-70089.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152501-27859.png)
∴Rt△CAO∽Rt△ABE.·························· 2分
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152501-79488.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152501-66251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-97519.png)
(2)由Rt△CAO∽Rt△ABE可知:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152501-64842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152502-94612.png)
当0<
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-63391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152502-23224.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152502-88639.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-63391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152502-94743.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152503-66536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152503-49218.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-18515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-73834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152458-79040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152503-45795.png)
(3)过M作MN⊥
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152457-70286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152503-24304.png)
当MB∥OA时,
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-54766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-84677.png)
抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-79159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-26459.png)
它的顶点在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-33459.png)
直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-33459.png)
∴1<
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152504-26459.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152459-44579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-68798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152500-19412.png)
核心考点
试题【如图,在平面直角坐标系中,点C的坐标为(0,4),动点A以每秒1个单位长的速度,从点O出发沿轴的正方向运动,M是线段AC的中点.将线段AM以点A为中心,沿顺时针】;主要考察你对轴对称等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-29048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-59809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-71491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-29048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-76255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-71491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152453-93995.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152448-99947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152445-51449.png)
A.3 B.1 C.2 D.不确定
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106152442-36372.png)
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