题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024252-91084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024253-51211.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024255-41960.png)
核心考点
举一反三
(1)若花园的面积为192m2, 求x的值;
(2)若在P处有一棵树与墙CD,AD的距离分别是15m和6m,要将这棵树围在花园内(含边界,不考虑树的粗细),求花园面积S的最大值.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024245-24026.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024204-66201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024205-83254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024205-79494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024205-32349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024205-85963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024206-21653.png)
(1)若点D的横坐标为-5,求抛物线的函数表达式;
(2)若在第一象限的抛物线上有点P,使得以A,B,P为顶点的三角形与△ABC相似,求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024205-83254.png)
(3)在(1)的条件下,设F为线段BD上一点(不含端点),连接AF,一动点M从点A出发,沿线段AF以每秒1个单位的速度运动到F,再沿线段FD以每秒2个单位的速度运动到D后停止. 当点F的坐标是多少时,点M在整个运动过程中用时最少?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024206-97888.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024157-44324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024158-15838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024158-22335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024158-50062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024158-45642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024159-27224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024159-58670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024159-31460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024159-68048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024159-12102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024200-45039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024200-68424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024200-32463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019024200-14048.png)