题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062810-70024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062810-14637.png)
(1)求m的值,并将平移后的抛物线解析式写成
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062810-43350.png)
(2)将平移后的抛物线在x轴下方的部分沿x轴翻折到x轴上方,与平移后的抛物线没有变化的部分构成一个新的图象. 请写出这个图象对应的函数y的解析式,同时写出该函数在
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062810-28706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062810-74181.png)
(3)设一次函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062811-14618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062811-21069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062811-75599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062811-20231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062811-21069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062812-14988.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062812-26697.png)
又点(1,8)在图象上
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062812-69400.png)
∴ m=2
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062812-85840.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062812-31136.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062813-73270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062813-36368.png)
(3)不存在
理由:当y=y3且对应的-1<x<0时,
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062813-42845.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062813-17900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062814-20327.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062814-38645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062814-21860.png)
∴ 不存在正整数n满足条件
解析
(2)根据函数解析式画出图象,即可得出函数大小分界点;
(3)根据当y=y3且对应的﹣1<x<0时,x2+4x+3=nx+3,得出n取值范围即可得出答案.
核心考点
试题【已知抛物线的图象向上平移m个单位()得到的新抛物线过点(1,8).(1)求m的值,并将平移后的抛物线解析式写成的形式;(2)将平移后的抛物线在x轴下方的部分沿x】;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/20191019/20191019062759-24340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062759-91732.png)
(1)求抛物线的解析式和顶点坐标;
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062759-29877.png)
(3)若点P为x轴上方的抛物线上一动点(点P与顶点C不重合),PQ⊥AC于点Q,当△PCQ与△ACH相似时,求点P的坐标.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062800-65282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062753-39141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062753-21933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062753-45790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-73180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-58132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-57009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-70581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-58132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-57009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-70581.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-58132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-70581.png)
(2)设正方形ABCD的面积为S,求证:S=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-39598.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062755-73681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-58132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062754-58132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062755-20176.png)
A.![]() | B.y=2x2+3 | C.y=-2x2-1 | D.y=2(x+1)2-1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062741-53321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062741-35896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062741-21137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062741-19759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062733-20499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062733-44619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-60039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-22212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-21566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-82811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-42085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062735-48634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062733-20499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062734-82811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062735-99943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062735-35719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062733-20499.png)
(A)、
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062735-22460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062736-65259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062736-21619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019062736-60321.png)
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