如图
,若抛物线
的顶点
在抛物线
上,抛物线
的顶点
也在抛物线
上(点
与点
不重合),我们定义:这样的两条抛物
,
互为“友好”抛物线,可见一条抛物线的“友好”抛物线可以有多条.
如图
,已知抛物线
与
轴交于点
,试求出点
关于该抛物线对称轴对称的点
的坐标;
请求出以点
为顶点的
的友好抛物线
的解析式,并指出
与
中
同时随
增大而增大的自变量的取值范围;
若抛物
的任意一条友好抛物线的解析式为
,请写出
与
的关系式,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4549e7c048532d3c638f7552473e1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2aeead5b7404fcc892bc68f83c8fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2aeead5b7404fcc892bc68f83c8fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4549e7c048532d3c638f7552473e1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4549e7c048532d3c638f7552473e1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2aeead5b7404fcc892bc68f83c8fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f368f7e766967a9aa3f55d9ba94282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f6dcad497284d9e28baf9fbcae3bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d5ffaff36b7cefc02f2d4ccd27a653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f6dcad497284d9e28baf9fbcae3bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d5ffaff36b7cefc02f2d4ccd27a653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc4e856425489adef812c8b6fcaa0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f0361bf9cceaac6c89d8804756b5c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b42791b77924729f7e31712177b26af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5ca241bb7c313ef0366d3ddba93bc.png)
![](https://img.xkw.com/dksih/QBM/2018/11/9/2072089915686912/2074852262428672/STEM/44a2028c008c441d83ca6428cc749c4f.png?resizew=284)
更新时间:2018-01-14 00:13:52
|
【知识点】 y=a(x-h)²+k的图象和性质解读
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】已知直线
经过点
.
(1)用含有
的式子表示
;
(2)若直线
与
,
轴分别交于
,
两点,
面积为
,求
的取值范围;
(3)过点
的抛物线
与
轴交点为
,记抛物线的顶点为
,该抛物线是否存在点
使四边形
为平行四边形?若存在,求此时顶点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972c39d1295dadea9505e3b2ac6b9f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a42451bdbef6c82dbaf8e06f0614794.png)
(1)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f146c85fc1161b351519727265924fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc9676bcec9af1b7e6cb0a03588e059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】已知函数y1=2kx+k与函数
,定义新函数y=y2﹣y1
(1)若k=2,则新函数y= ;
(2)若新函数y的解析式为y=x2+bx﹣2,则k= ,b= ;
(3)设新函数y顶点为(m,n).
①当k为何值时,n有大值,并求出最大值;
②求n与m的函数解析式;
(4)请你探究:函数y1与新函数y分别经过定点B,A,函数
的顶点为C,新函数y上存在一点D,使得以点A,B,C,D为顶点的四边形为平行四边形时,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241780209875849492e4bad928fd7c70.png)
(1)若k=2,则新函数y= ;
(2)若新函数y的解析式为y=x2+bx﹣2,则k= ,b= ;
(3)设新函数y顶点为(m,n).
①当k为何值时,n有大值,并求出最大值;
②求n与m的函数解析式;
(4)请你探究:函数y1与新函数y分别经过定点B,A,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241780209875849492e4bad928fd7c70.png)
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解答题-作图题
|
较难
(0.4)
名校
【推荐3】如图,在一次学校组织的社会实践活动中,小龙看到农田上安装了很多灌溉喷枪,喷枪喷出的水流轨迹是抛物线,他发现这种喷枪射程是可调节的,且喷射的水流越高射程越远,于是他从该农田的技术部门得到了这种喷枪的一个数据表,水流的最高点与喷枪的水平距离记为
,水流的最高点到地面的距离记为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/450c4bb0-4900-4e93-b592-22e6f083a91a.png?resizew=483)
与
的几组对应值如下表:
(1)该喷枪的出水口到地面的距离为________
;
(2)在平面直角坐标系
中,描出表中各组数值所对应的点,并画出
与
的函数图象;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/09174228-5ec4-49d6-a3ee-1b6be181119d.png?resizew=337)
(3)结合(2)中的图象,估算当水流的最高点与喷枪的水平距离为
时,水流的最高点到地面的距离为________
(精确到
).根据估算结果,计算此时水流的射程约为________
(精确到
,参考数据
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/450c4bb0-4900-4e93-b592-22e6f083a91a.png?resizew=483)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() ![]() | 0 | ![]() | 1 | ![]() | 2 | ![]() | 3 | 4 | … |
![]() ![]() | 2 | ![]() | ![]() | ![]() | 3 | ![]() | ![]() | 4 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
(2)在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/09174228-5ec4-49d6-a3ee-1b6be181119d.png?resizew=337)
(3)结合(2)中的图象,估算当水流的最高点与喷枪的水平距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea92883fe24b097c9a881ef8c92eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28099a02a19419a582bfb6f103fe0a3c.png)
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