已知抛物线
(
),点
,
在抛物线上,且函数的最小值为0.
(1)求
,
的值;
(2)若直线
:
与抛物线交于
,
两点(点
在点
左侧),与
轴交于点
.当
时,
.
(Ⅰ)求
的值.
(Ⅱ)是否在
轴上存在定点
,当
的值发生变化时,抛物线上总存在点
,使得四边形
为平行四边形.若存在,求出点
的坐标.若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b133403156e1275c9fefff08b49dcfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d943dcbc09a7900b351aeb8d797af690.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919fac5593e8567c11ba2315ea5bef9.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/7f9e8449aad35c5d840a3395ea86df6d.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/8f2f91aa5dea19712561c7905535d15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756c8636ebf02059c5a83536f191a06d.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)是否在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d4ab45e8e8f0084d8d90a4c1233d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
更新时间:2022-03-04 10:36:46
|
相似题推荐
解答题-问答题
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解题方法
【推荐1】如图,在平面直角坐标系
中,一次函数
(m为常数) 的图象与x轴交于点
,与y轴交于点C,以直线
为对称轴的拋物线
(a、b、c为常数,且
)经过A、C两点,并与x轴的正半轴交于点B.(参考公式:在平面直角坐标之中,若
,则A,B两点间的距离为
)
(2)是否存在抛物线上一动点Q,使得
是以
为直角边的直角三角形?若存在,求出Q点的横坐标;若存在,请说明理由;
(3)若P是抛物线对称轴上一动点, 且使
周长最小,过点P任意作一条与y轴不平行的直线交抛物线于
两点,试问
是否为定值,如果是,请求出结果,如果不是请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86025316510d487425e1efdb390ce5d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf9ebc750f290b4efbe91f3477967fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4daf40bad1cc89311930cce356672354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353cd70ab89167bbda2ad9abd50fae1a.png)
(2)是否存在抛物线上一动点Q,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1eda00fc2d64ce3a42004b24adf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)若P是抛物线对称轴上一动点, 且使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee40af730f0a94b314c9f138424e0f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40ba6a96fa97a0fee053b9ceee87741.png)
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【推荐2】如图,在平面直角坐标系中,直线
与
轴交于点
,与
轴交于点
,与双曲线
交于点
,点
是双曲线上的动点,横坐标为
,作
轴交直线
于点
,连接
、
.
(1)求a、b的值;
(2)求
的面积
与
的函数关系式,并求
的最大值;
(3)当四边形
为平行四边形时,连接
,并将直线
向上平移
个单位后与反比例函数
的图象交于
、
两点,与直线
交于点
,设
、
、
三点的横坐标分别为
、
、
,是否存在正实数
使得等式
成立,如果存在,求出
的值,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694033aa4e20853cf10f33c870007047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/96c9708655425573d368c9a4deeeba82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcb0b01efad6a4feb6d4934e7042c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae95ee19c0364b7a92e468ee2a21fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815d1ce1ba84bac399c8b20e074cf045.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/93c9a4d6-dec9-44d2-8432-984ecb8bba8b.png?resizew=141)
(1)求a、b的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de172b1c4aabd5b23d7b265ac78d96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888cf62de648e7c3694e6258f20d62ae.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.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/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea17ffdc0adcfb4f0ec4781c4e0186e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11417e967efe6ff509168e00eae6135a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d086d58ae2d07117f8bdeb1f63d1f9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bf90d7db34f2cc527a7ac0df967dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】x、y是一个函数的两个变量,若当a≤x≤b时,有a≤y≤b(a<b),则称此函数为a≤x≤b上的闭函数.如y=﹣x+3,当x=1时y=2;当x=2时y=1,即当1≤x≤2时,1≤y≤2,所以y=﹣x+3是1≤x≤2上的闭函数.
(1)请说明
是
上的闭函数;
(2)已知二次函数y=x2+4x+k是t≤x≤﹣2上的闭函数,求k和t的值;
(3)在(2)的情况下,设A为抛物线顶点,B为直线x=t上一点,C为抛物线与y轴的交点,若△ABC为等腰直角三角形,请直接写出它的腰长为________________.
(1)请说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5894f0258b4b0acb81412de25a8478de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
(2)已知二次函数y=x2+4x+k是t≤x≤﹣2上的闭函数,求k和t的值;
(3)在(2)的情况下,设A为抛物线顶点,B为直线x=t上一点,C为抛物线与y轴的交点,若△ABC为等腰直角三角形,请直接写出它的腰长为________________.
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【推荐2】如图,在平面直角坐标系中,已知抛物线
与
轴交于
、
两点,与
轴交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/3/17/2679936838967296/2683176474107904/STEM/3e6f4a30-4a13-4830-ac15-929df0d2caf1.png?resizew=171)
(1)求该抛物线的解析式,并写出它的对称轴;
(2)已知
,若
是抛物线上一个动点(其中
),连接
,
,
,求
面积的最大值及此时点
的坐标;
(3)若点
为抛物线对称轴上一点,抛物线上是否存在点
,使得以B,C,M,N为顶点的四边形是平行四边形?若存在,请直接写出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dd4534f6b65873203976e56d84e5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/3/17/2679936838967296/2683176474107904/STEM/3e6f4a30-4a13-4830-ac15-929df0d2caf1.png?resizew=171)
(1)求该抛物线的解析式,并写出它的对称轴;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632541024f42a0eab66f8e43911db06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d301c349066cc3b8f4d37a7e221edec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a551a88ac426439803f564a3bbee04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】如图,抛物线y=﹣x2+bx+c与x轴交于A、B两点(A在B的左侧),与y轴交于点N,过A点的直线l:y=kx+n与y轴交于点C,与抛物线y=﹣x2+bx+c的另一个交点为D,已知A(﹣1,0),D(5,﹣6),P点为抛物线y=﹣x2+bx+c上一动点(不与A、D重合).
(1)直接写出抛物线和直线l的解析式;
(2)当点P在直线l上方的抛物线上时,连接PA、PD,
①当△PAD的面积最大时,P点的坐标是 ;
②当AB平分∠DAP时,求线段PA的长.
(3)设M为直线l上的点,探究是否存在点M,使得以点N、C,M、P为顶点的四边形为平行四边形?若存在,直接写出点M的坐标;若不存在,请说明理由.
(1)直接写出抛物线和直线l的解析式;
(2)当点P在直线l上方的抛物线上时,连接PA、PD,
①当△PAD的面积最大时,P点的坐标是 ;
②当AB平分∠DAP时,求线段PA的长.
(3)设M为直线l上的点,探究是否存在点M,使得以点N、C,M、P为顶点的四边形为平行四边形?若存在,直接写出点M的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/da6d2c57-6d99-4e3f-8693-397ed16d5fc3.png?resizew=177)
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【推荐2】如图,在平面直角坐标系中,将一块等腰直角三角板ABC放在第二象限,且斜靠在两坐标轴上,直角顶点C的坐标为(-1,0),点A的坐标为(0,2)点B在
抛物线y=ax 2+ax-2上.
![](https://img.xkw.com/dksih/QBM/2015/6/17/1573849266257920/1573849272705024/STEM/553240c85c11423b91326c1445ebef4e.png)
(1)点B的坐标为_____________; 抛物线的关系式为________________________;
(2)若点D是(1)中所求抛物线在第三象限内的一个动点,连接BD、CD.当△BCD的面积最大时,求点D的坐标;
(3)若将三角板ABC沿射线BC平移得到△A ′B ′C′,当C ′ 在抛物线上时.问此时四边形AC C ′A ′是什么特殊四边形?请证明?并判断点A ′是否在抛物线上,请说明理由;
抛物线y=ax 2+ax-2上.
![](https://img.xkw.com/dksih/QBM/2015/6/17/1573849266257920/1573849272705024/STEM/553240c85c11423b91326c1445ebef4e.png)
(1)点B的坐标为_____________; 抛物线的关系式为________________________;
(2)若点D是(1)中所求抛物线在第三象限内的一个动点,连接BD、CD.当△BCD的面积最大时,求点D的坐标;
(3)若将三角板ABC沿射线BC平移得到△A ′B ′C′,当C ′ 在抛物线上时.问此时四边形AC C ′A ′是什么特殊四边形?请证明?并判断点A ′是否在抛物线上,请说明理由;
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