题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-49280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-49280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-94794.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-38294.png)
解析
试题分析:1)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-38294.png)
(2)面积
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045458-90940.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045458-61965.png)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045457-52998.png)
(3)当面积
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045458-77865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045458-61965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045458-81564.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045459-27210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045459-77897.png)
即当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045459-77897.png)
点评:在解题时要能灵运用二次函数的图象和性质求出二次函数的解析式,利用数形结合思想解题是本题的关键
核心考点
试题【某中学课外活动小组准备围建一个矩形生物苗圃园,其中一边靠墙,另外三边用长为50米的篱笆围成。已知墙长为26米(如图所示),设这个苗圃园平行于墙的一边的长为米。(】;主要考察你对二次函数定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045451-21321.png)
(1)求点C的坐标,并求出抛物线的函数解析式;
(2)抛物线的对称轴被直线l1,抛物线,直线l2和x轴依次截得三条线段,问这三条线段有何数量关系?请说明理由;
(3)当直线l2绕点C旋转时,与抛物线的另一个交点为M,请找出使△MCK为等腰三角形的点M,简述理由,并写出点M的坐标.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045442-68549.png)
(1)如图1,求抛物线y=(x﹣2)2+1的伴随直线的表达式.
(2)如图2,若抛物线y=a(x﹣m)2+n(m>0)的伴随直线是y=x﹣3,伴随四边形的面积为12,求此抛物线的表达式.
(3)如图3,若抛物线y=a(x﹣m)2+n的伴随直线是y=﹣2x+b(b>0),且伴随四边形ABCD是矩形.用含b的代数式表示m、n的值.
x | 0 | 1 | 2 | 3 | 4 |
y | 3 | 0 | -2 | 0 | 3 |
A.y=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045438-39630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045439-28007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045439-91261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045434-77541.jpg)
A.1 | B.2 | C.3 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-49039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-55584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-62986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-49039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-24754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-12618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-24754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-12618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-55875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-30418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-62166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-75085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-21114.png)
(1)求出一元二次函数的关系式;
(2)点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-86987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-35470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-86987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045427-49039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-91300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-25941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045428-45484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-32952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-77106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-77106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-71185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-71185.png)
(3)在(2)的条件下,当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-39343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019045429-32952.png)
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