题目
题型:广东省中考真题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185855-78613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185856-84571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185856-70022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185856-45804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185856-78741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185857-77534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185857-34561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185857-71416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185857-84928.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185857-42954.gif)
(1)若点E落在边
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185858-42008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185858-71618.gif)
(2)若点E落在矩形纸片
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185858-85532.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185858-57372.gif)
(3)在(1)的情况下,过点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185859-53052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185859-67001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185859-81174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185900-65853.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185900-30740.gif)
可得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185900-64357.gif)
设过此三点的抛物线为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185900-17485.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185901-80864.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185901-78997.gif)
∴过
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185901-69955.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185901-28213.gif)
(2)由已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185902-26667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185902-49317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185902-14914.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185903-11437.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185903-70087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185903-93080.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185903-80051.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185903-54658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185904-63102.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185904-25856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185904-33399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185904-40636.gif)
∴ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185905-50417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185905-94816.gif)
(3)假设存在,分两种情况讨论:
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185905-25565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185906-83372.gif)
故点C与点Q重合,
所求的点Q为(0,3)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185906-36824.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185906-87184.gif)
假设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185906-68904.gif)
∵点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185907-84197.gif)
∴直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185907-40237.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185907-35905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185908-65371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185908-96090.gif)
∴直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185908-56646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185908-29729.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185908-13576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185909-37510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185909-98726.gif)
又点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185909-73531.gif)
故该抛物线上存在两点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185909-55724.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185910-25394.gif)
核心考点
试题【已知矩形纸片的长为4,宽为3,以长所在的直线为x轴,O为坐标原点建立平面直角坐标系;点P是OA边上的动点(与点不重合),现将沿PC翻折得到,再在边上选取适当的点】;主要考察你对二次函数的应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185851-94689.gif)
B.20 m/s
C.10 m/s
D.5 m/s
(1)求该抛物线所对应的函数关系式;
(2)将矩形ABCD以每秒1个单位长度的速度从图2所示的位置沿x轴的正方向匀速平行移动,同时一动点P也以相同的速度从点A出发向B匀速移动,设它们运动的时间为t秒(0≤t≤3),直线AB与该抛物线的交点为N(如图3所示).
① 当t=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185843-32433.gif)
② 设以P、N、C、D为顶点的多边形面积为S,试问S是否存在最大值?若存在,求出这个最大值;若不存在,请说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185843-84243.gif)
(1)当t = 2时,AP =_____ ,点Q到AC的距离是_____ ;
(2)在点P从C向A运动的过程中,求△APQ的面积S与 t的函数关系式;(不必写出t的取值范围)
(3)在点E从B向C运动的过程中,四边形QBED能否成为直角梯形?若能,求t的值.若不能,请说明理由;
(4)当DE经过点C 时,请直接写出t的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185830-95514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185821-57663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185821-41011.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185822-71361.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185822-17076.gif)
(1)求此抛物线的解析式;
(2)直接写出此抛物线的对称轴和顶点坐标;
(3)连接BC,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185822-52426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185822-24506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185806-63161.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185806-98717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185806-12249.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185806-64389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185806-54613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185807-48706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185807-35803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185807-90890.gif)
(1)当矩形
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185807-15140.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185808-43890.gif)
(3)直接写出S与t的函数关系式;(不必写出解题过程)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185808-45370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020185808-41758.gif)
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