在平面直角坐标系中,抛物线
经过点
,点
、
为该抛物线上两点,点
的横坐标为
,点
的横坐标为
.当点
不在
轴上时,过点
作
轴的垂线交
轴于点
,以
、
为边作
,将
向
轴正方向平移一个单位长度得到
.
(1)求抛物线
的函数表达式;
(2)当
是矩形时,求
的值;
(3)当
轴将
分成面积相等的两部分图形时,求
的面积;
(4)当抛物线
在
轴右侧的部分与
有两个公共点,且右公共点与左公共点的横坐标之差小于
时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a69144e8a38f3ed31018d5a21b026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1e94f660b7d05de4be4b5fbd9041f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c419d5155197a24c3162e76614a8d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c419d5155197a24c3162e76614a8d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4183d9cb0e9fcba8bbe0bef6d51e1399.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a69144e8a38f3ed31018d5a21b026.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4183d9cb0e9fcba8bbe0bef6d51e1399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c419d5155197a24c3162e76614a8d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4183d9cb0e9fcba8bbe0bef6d51e1399.png)
(4)当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a69144e8a38f3ed31018d5a21b026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4183d9cb0e9fcba8bbe0bef6d51e1399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2024-04-17 19:15:36
|
相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系中,抛物线
与x 轴交于
,
两点,与
轴交于点
,
为抛物线的顶点.
(2)如图1,点
,
在抛物线上,点
在点
左侧,若
是等边三角形,求
的值.
(3)如图2,在线段
上是否存在一点
,使得以
,
,
为顶点的三角形与
相似
若存在,求点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.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/8455657dde27aabe6adb7b188e031c11.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9830acda0cc6c2fa6e398ac2c2fd4e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60469f315a0faa6d963515b9490edab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbee7c5da546abb929a7a0ff5319ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)如图2,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bbee662e242611afdbdae4b8a36a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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真题
【推荐2】已知二次函数y=ax2+bx+c(a≠0)的图象经过点(1,0),(5,0),(3,﹣4).
![](https://img.xkw.com/dksih/QBM/2013/9/6/1573679420981248/1573679426609152/STEM/4261a4b0-79dc-4687-861c-ed5f7270ef54.png?resizew=163)
(1)求该二次函数的解析式;
(2)当y>﹣3,写出x的取值范围;
(3)A、B为直线y=﹣2x﹣6上两动点,且距离为2,点C为二次函数图象上的动点,当点C运动到何处时△ABC的面积最小?求出此时点C的坐标及△ABC面积的最小值.
![](https://img.xkw.com/dksih/QBM/2013/9/6/1573679420981248/1573679426609152/STEM/4261a4b0-79dc-4687-861c-ed5f7270ef54.png?resizew=163)
(1)求该二次函数的解析式;
(2)当y>﹣3,写出x的取值范围;
(3)A、B为直线y=﹣2x﹣6上两动点,且距离为2,点C为二次函数图象上的动点,当点C运动到何处时△ABC的面积最小?求出此时点C的坐标及△ABC面积的最小值.
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【推荐1】我们不妨约定在二次函数
中,若
,则把该函数称之为“明麓函数”,根据该约定,完成下列各题.
(1)在下列关于
的函数中,若是“明麓函数”的,请在相应题目后的括号中打“√”,若不是“明麓函数”的,请在相应的题目后打“×”.
①
( )②
( )③
( )
(2)求证:“明麓函数”
与直线
总有两个不同的交点.
(3)已知“明麓函数”
与直线
相交于A、B两点,P是“明麓函数”
上的一个动点,并在直线
的下方,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8cad38fc359a9cbe0160edb25c1bf3.png)
(1)在下列关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b629bea8e22de9bfc49158e2289871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db9ddb5600d77c0306734ac656b84cc.png)
(2)求证:“明麓函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
(3)已知“明麓函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
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【推荐2】如图,已知抛物线
的图象与x轴交于点A(1,0),B(-3,0),与y轴的正半轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/65d5a5c2-ed24-42fa-afc4-06780093a614.png?resizew=400)
(1)求该抛物线的解析式;
(2)点D是线段
上一动点,过点D作y轴的平行线,与
交于点E,与抛物线交于点F.
①连接
,当
的面积最大时,求此时点F的坐标;
②探究是否存在点D使得
为直角三角形?若存在,求出点F的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/65d5a5c2-ed24-42fa-afc4-06780093a614.png?resizew=400)
(1)求该抛物线的解析式;
(2)点D是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d424c8a10c470f413028e31217b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a0c85deb80d8e63bc60127e803f7ea.png)
②探究是否存在点D使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
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【推荐1】在平面直角坐标系
中,二次函数
的图象与
轴正半轴交于
点.
![](https://img.xkw.com/dksih/QBM/2018/9/16/2033765908643840/2034514258190336/STEM/8f788ae6bd5c4fd9ad2657627daea52b.png?resizew=179)
求证:该二次函数的图象与
轴必有两个交点;
设该二次函数的图象与
轴的两个交点中右侧的交点为点
,若
,将直线
向下平移
个单位得到直线
,求直线
的解析式;
在
的条件下,设
为二次函数图象上的一个动点,当
时,点
关于
轴的对称点都在直线
的下方,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab27673c9b42877901f4d19b5c594e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501d2ee2ba4e873f6715bd08b18795cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://img.xkw.com/dksih/QBM/2018/9/16/2033765908643840/2034514258190336/STEM/8f788ae6bd5c4fd9ad2657627daea52b.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60154a7fc33818fb772077e1ccb1b444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf6101c529b7868bc1c2fd46aca16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9957f52a4f4a424e522d0afb0bbcdabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9957f52a4f4a424e522d0afb0bbcdabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc966f9fe1d41b0240126b8275219c51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc654a27d7d998f8471d68e791b50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f1796428c2600bbbdff746b0311583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9957f52a4f4a424e522d0afb0bbcdabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022abc6afd4deff13845419fa38312e.png)
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【推荐2】定义:在平面直角坐标系中,某个函数图象上任意两点的坐标分别为(x1,y1),(x2,y2),且x1≤x2,d=|y1-y2|.将这个函数图象在直线y=y1下方部分沿直线y=y1翻折,并将其向上平移d个单位,将这部分图象与原函数图象剩余部分的图象组成的新图象记为G,图象G对应的函数叫做这个函数的伴随函数.例如:点A(1,0)、B(2,1)在一次函数y=x-1的图象上,则它的伴随函数为
.
(1)点A、B在直线y=-2x上,点A在第二象限,点B在x轴上.当d=2时,求函数y=-2x的伴随函数所对应的函数表达式.
(2)二次函数y=x2-2x-3的图象交x轴负半轴交于点A,点B在抛物线上,设点B的横坐标为m.
①当d=0时,求该抛物线的伴随函数的图象G与直线y=4在第一象限的交点坐标;
②若直线y=2与该抛物线的伴随函数的图象G有四个交点,直接写出m的取值范围.
(3)抛物线y=x2-2nx+n2-n-1与y轴交于点A,点B在点A的左侧抛物线上,且d=1,当该抛物线的伴随函数的图象G上的点到x轴距离的最小值为1时,直接写出n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eef59f7dee274771d739c8a56dc5ae6.png)
(1)点A、B在直线y=-2x上,点A在第二象限,点B在x轴上.当d=2时,求函数y=-2x的伴随函数所对应的函数表达式.
(2)二次函数y=x2-2x-3的图象交x轴负半轴交于点A,点B在抛物线上,设点B的横坐标为m.
①当d=0时,求该抛物线的伴随函数的图象G与直线y=4在第一象限的交点坐标;
②若直线y=2与该抛物线的伴随函数的图象G有四个交点,直接写出m的取值范围.
(3)抛物线y=x2-2nx+n2-n-1与y轴交于点A,点B在点A的左侧抛物线上,且d=1,当该抛物线的伴随函数的图象G上的点到x轴距离的最小值为1时,直接写出n的值.
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