如图,在平面直角坐标系中,直线y=﹣
x﹣
与x轴交于点A,与y轴交于点C,抛物线y=ax2﹣
x+c(a≠0)经过A,B,C三点.
![](https://img.xkw.com/dksih/QBM/2022/3/1/2927095373111296/2927703103635456/STEM/9a637c42-50c5-485d-92bb-3155895f823d.png?resizew=160)
(1)求过A,B,C三点抛物线的解析式并求出顶点F的坐标;
(2)在抛物线上是否存在点P,使△ABP为直角三角形?若存在,直接写出P点坐标;若不存在,请说明理由;
(3)试探究在直线AC上是否存在一点M,使得△MBF的周长最小?若存在,求出M点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2927095373111296/2927703103635456/STEM/9a637c42-50c5-485d-92bb-3155895f823d.png?resizew=160)
(1)求过A,B,C三点抛物线的解析式并求出顶点F的坐标;
(2)在抛物线上是否存在点P,使△ABP为直角三角形?若存在,直接写出P点坐标;若不存在,请说明理由;
(3)试探究在直线AC上是否存在一点M,使得△MBF的周长最小?若存在,求出M点的坐标;若不存在,请说明理由.
2021·山东烟台·二模 查看更多[1]
更新时间:2022-03-02 19:30:07
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解题方法
【推荐1】如图,直线
与
轴、
轴分别交
、
两点,点
关于原点
的对称点是点
.动点
从
出发以每秒1个单位的速度运动到点
,点
在线段
上满足
,过
点作
于点
,点
关于点
的对称点为点
,以
为直径作
,设点
运动的时间为
秒.
(1)当点
在段
上运动,
______时,
与
的相似比为
;
(2)当
与
轴相切时,求
的值;
(3)若直线
与
交于点
,是否存在使
,若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60ecd5f53b3469726c8cb09e86ff20b.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17853d8c182580fc2cf9a21f6925aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf81da91f4f486850d143c5963abc13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a105f1aaaa35057413aacd7f5e160c0e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db50ea4bf2899d55a7fc06fbac77d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/3/27/2428551047495680/2432955313356800/STEM/8a6f5b06477b49f081c0c82ac24daf6d.png?resizew=166)
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名校
【推荐2】如图,E是边长为4的正方形
边
上一点,
长为1.点F从点B开始,在正方形的边上,沿着
方向运动,到达点C后停止运动.点A关于直线
的对称点为
.
![](https://img.xkw.com/dksih/QBM/2021/6/10/2739841700257792/2740611061194752/STEM/55664010-fd25-47d1-b5f8-c310d2c83f7b.png?resizew=246)
从“点”开始
(1)求点
与点D的最小距离和最大距离.
由“点”到“线”
(2)当直线
与点
的轨迹(即点
运动形成的图形)有且只有1个公共点时,
的长是________.
拓“线”成“形”
(3)在点F经过点A后 至点F到达点C前 的过程中,当点
恰好落在正方形
的边所在直线上时,直接写出此时点F运动的路程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158b016cb6e060f7fd97c9133cb5016c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2739841700257792/2740611061194752/STEM/55664010-fd25-47d1-b5f8-c310d2c83f7b.png?resizew=246)
从“点”开始
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
由“点”到“线”
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8049be7e7cd824771471bfac2bf70ae9.png)
拓“线”成“形”
(3)在点F经过点A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐3】二次函数
的图象与x轴交于两点A、B,与y轴交于点C,且
.
(1)求此二次函数的表达式;
(2)如图1,点E是第一象限内的抛物线上的动点,过点E作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
y轴交直线
于点F,
①连接
,当点E运动到什么位置时,
的面积最大?求
面积的最大值;
②当
是等腰三角形时,求点E坐标;
(3)如图2,点M在抛物线上,且点M的横坐标是1,将射线
绕点M逆时针 旋转
交抛物线于点D,求点D的坐标;
(4)如图3,点P是抛物线的顶点,抛物线的对称轴与x轴交于点Q,过点P作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
交x轴于点N,在抛物线的对称轴上是否存在一点H,使得
,若存在,直接写出点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351eb033449e6f4e71f9c2e5607908aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/2ef00878-8245-4138-9f95-28e43d9ee5fd.png?resizew=463)
(1)求此二次函数的表达式;
(2)如图1,点E是第一象限内的抛物线上的动点,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c41d752591e4a2aec0d8785e9bcf1b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
(3)如图2,点M在抛物线上,且点M的横坐标是1,将射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
(4)如图3,点P是抛物线的顶点,抛物线的对称轴与x轴交于点Q,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0775dc0d40db7eb3f9070523886135cd.png)
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【推荐1】平面直角坐标系
中,矩形OABC的顶点A,C的坐标分别为
,
,点D是经过点B,C的抛物线
的顶点.
(1)求抛物线的解析式;
(2)点E是(1)中抛物线对称轴上一动点,求当△EAB的周长最小时点E的坐标;
(3)平移抛物线,使抛物线的顶点始终在直线CD上移动,若平移后的抛物线与射线 BD只有一个公共点,直接写出平移后抛物线顶点的横坐标
的值或取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a812a9b58ccba331cfd21d244329af01.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
(1)求抛物线的解析式;
(2)点E是(1)中抛物线对称轴上一动点,求当△EAB的周长最小时点E的坐标;
(3)平移抛物线,使抛物线的顶点始终在直线CD上移动,若平移后的抛物线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知,在平面直角坐标系中,抛物线
与x轴交于点
,点
,交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/ca69216c-4cd2-4f2c-9650-41508f107f59.png?resizew=436)
(1)求抛物线的解析式:
(2)如图1,点
在抛物线第一象限上,过点
作
轴于点
,交
于点
,设点
的横坐标为
,
的长为
,求
与
的函数关系式:(不要求写出
的取值范围)
(3)如图2,在(2)的条件下,点
在抛物线第四象限上,连接
、
,
与
交于点
,
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2375a27ead9549550676d4e6a2b47243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/ca69216c-4cd2-4f2c-9650-41508f107f59.png?resizew=436)
(1)求抛物线的解析式:
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa244ee5c0f0ca3a5cbeff87606c90e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec4ef9b210c7a0de5529940b62319ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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