如图,已知二次函数
的图像交
轴分别于
,
两点,交
轴于
点,顶点为
.
(1)求抛物线的对称轴;
(2)判断
的形状并证明,及求
;
(3)在
轴上是否存在一点
,使得以
,
,
三点为顶点的三角形与
相似?如果存在,请求出点
的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/1882429b-a73c-4408-bb4a-ba7c94e21832.png?resizew=157)
(1)求抛物线的对称轴;
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b732912cec85d7818ba891cdf82ed.png)
(3)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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
更新时间:2023-08-21 09:50:31
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相似题推荐
解答题-问答题
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【推荐1】如图,AB是一条笔直的长为500m的滑雪坡道,某运动员从坡顶A滑出,沿直线滑向坡底B,她的滑行距离y(单位:m)与滑行时间x(单位:s)的部分对应值如下表.
(2)一架无人机在AB上空距水平地面292m的P处悬停,此时在A处测得无人机的仰角为53°.无人机和该运动员同时开始运动,无人机以6.3m/s的速度匀速水平飞行拍摄,离A处越来越远.已知无人机(看成一个点)与AB(看成一条线段)所确定的平面始终垂直于地面,AB与地面MN的夹角为26°.求该运动员滑行多久时,她恰在无人机的正下方.
(参考数据:tan53°≈
,sin26≈0.44,cos26°≈0.90,tan26°≈0.49.)
x | 0 | 1 | 2 | 3 | 4 | … |
y | 0 | 4.5 | 14 | 28.5 | 48 | … |
(2)一架无人机在AB上空距水平地面292m的P处悬停,此时在A处测得无人机的仰角为53°.无人机和该运动员同时开始运动,无人机以6.3m/s的速度匀速水平飞行拍摄,离A处越来越远.已知无人机(看成一个点)与AB(看成一条线段)所确定的平面始终垂直于地面,AB与地面MN的夹角为26°.求该运动员滑行多久时,她恰在无人机的正下方.
(参考数据:tan53°≈
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
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【推荐2】如图,抛物线
交
轴于点
、
(点
在点
的左侧),与
轴交于点
,点
、
的坐标分别为(-3,0),(0,3),对称轴
交
轴于
,点
为抛物线顶点.
(1)求抛物线的解析式.
(2)点
是直线
下方的抛物线上一点,且
.求
的坐标.
(3)
为抛物线对称轴上一点,是否存在以
、
、
为顶点的
是等腰三角形,若存在,直接写出点
的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.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/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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求抛物线的解析式.
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cef550181bf53e69e44d83c91340de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45504031c84b187f9c6324622415ea22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2020/9/28/2566465861181440/2609796796579840/STEM/4a1fdb98-58b1-400e-9904-8b548633f2ff.png)
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【推荐1】如图,抛物线y=ax2+
x+c与x轴交于点A,B,与y轴交于点C,已知A,C两点坐标分别是A(1,0),C(0,﹣2),连接AC,BC.
(1)求抛物线的表达式和AC所在直线的表达式;
(2)将
ABC沿BC所在直线折叠,得到
DBC,点A的对应点D是否落在抛物线的对称轴上,若点D在对称轴上,请求出点D的坐标;若点D不在对称轴上,请说明理由;
(3)若点P是抛物线位于第三象限图象上的一动点,连接AP交BC于点Q,连接BP,
BPQ的面积记为S1,
ABQ的面积记为S2,求
的值最大时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)求抛物线的表达式和AC所在直线的表达式;
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)若点P是抛物线位于第三象限图象上的一动点,连接AP交BC于点Q,连接BP,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐2】如图,Rt△ABC中,∠BAC=90°,AB=2,AC=4,D是BC边上一动点,G是BC边上的一动点,GE∥AD分别交AC、BA或其延长线于F、E两点
(1)如图1,当BC=5BD时,求证:EG⊥BC;
(2)如图2,当BD=CD时,FG+EG是否发生变化?证明你的结论;
(3)当BD=CD,FG=2EF时,DG的值= .
(1)如图1,当BC=5BD时,求证:EG⊥BC;
(2)如图2,当BD=CD时,FG+EG是否发生变化?证明你的结论;
(3)当BD=CD,FG=2EF时,DG的值= .
![](https://img.xkw.com/dksih/QBM/2019/11/6/2328191893192704/2331446231719936/STEM/d7988d783503489dbc0aba0cb741a24a.png?resizew=537)
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【推荐3】如图,直线y=﹣x+3与x轴,y轴分别相交于点B,C,经过B,C两点的抛物线y=ax2+bx+c与x轴的另一交点为A,顶点为P,且对称轴是直线x=2.
(1)求该抛物线的函数表达式;
(2)请问在抛物线上是否存在点Q,使得以点B,C,Q为顶点的三角形为直角三角形?若存在,请求出点Q的坐标;若不存在,请说明理由;
(3)过S(0,4)的动直线l交抛物线于M,N两点,试问抛物线上是否存在定点T,使得不过定点T的任意直线l都有∠MTN=90°?若存在,请求出点T的坐标;若不存在,请说明理由.
(1)求该抛物线的函数表达式;
(2)请问在抛物线上是否存在点Q,使得以点B,C,Q为顶点的三角形为直角三角形?若存在,请求出点Q的坐标;若不存在,请说明理由;
(3)过S(0,4)的动直线l交抛物线于M,N两点,试问抛物线上是否存在定点T,使得不过定点T的任意直线l都有∠MTN=90°?若存在,请求出点T的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/1/4/1853058652504064/1853780021248000/STEM/bc08cb2d650a40a8bbdd779b47e8de57.png?resizew=137)
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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,交y轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/d6b85385-5f99-47a6-8b0d-63430d2fdd86.png?resizew=329)
(1)求抛物线的表达式;
(2)点
是直线
上方抛物线上的一动点,过点
作
轴交
于点
,在
轴上取一点
,使得
,求
的最大值及此时点
坐标;
(3)将原抛物线沿射线
方向平移
个单位长度得到新抛物线
,过点
作直线
垂直于
交
轴于点
,交新抛物线
于点
,请直接写出点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/d6b85385-5f99-47a6-8b0d-63430d2fdd86.png?resizew=329)
(1)求抛物线的表达式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213144e25996b7fd3cd69d9c5ae56be2.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa1b5b6051d500fe6c6f1c19c7ee49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b09bfc38ea7512ad999424243ae5b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)将原抛物线沿射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解题方法
【推荐2】如图(1),在平面直角坐标系中抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
与
轴交于点
,与
轴交于点
,且经过点
,连接
,
,作
于点
,将
沿
轴翻折,点
的对应点为点
.解答下列问题:
(1)抛物线的解析式为_______,顶点坐标为________;
(2)判断点
是否在直线
上,并说明理由;
(3)如图(2),将图(1)中
沿着
平移后,得到
.若
边在线段
上,点
在抛物线上,连接
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5bb89c3ad435f1ef59307b174105ed.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dd31773f55719ebd91ed3389d0de68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8efe0cd08f051818b21f7bca7f1183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbff7b09a866394e0539f5e4121b0ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8681a8c39ee0d640206470b901fa35b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/a1cd6dea-81a4-415d-93ce-a7c34dcb2ec3.png?resizew=407)
(1)抛物线的解析式为_______,顶点坐标为________;
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图(2),将图(1)中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8681a8c39ee0d640206470b901fa35b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5d835ca247252e4903af22789b5f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a6f856872cd504d322ae27919ef2db.png)
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【推荐1】如图,已知抛物线y=-x2+bx+c交y轴于点A(0,4),交x轴于点B(4,0),点P是抛物线上一动点,过点P作x轴的垂线PQ,过点A作AQ⊥PQ于点Q,连接AP.
(1)求抛物线的解析式及点C的坐标;
(2)点P在抛物线上运动,若△AQP∽△AOC,求点P的坐标.
(1)求抛物线的解析式及点C的坐标;
(2)点P在抛物线上运动,若△AQP∽△AOC,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118744969396224/2122898220761088/STEM/b38e48f69b2f459084aa1b3cb745b2f1.png?resizew=120)
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解答题-证明题
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较难
(0.4)
真题
【推荐2】如图,已知二次函数的图象过点A(0,﹣3),B(
),对称轴为直线
,点P是抛物线上的一动点,过点P分别作PM⊥x轴于点M,PN⊥y轴于点N,在四边形PMON上分别截取PC=
MP,MD=
OM,OE=
ON,NF=
NP.
![](https://img.xkw.com/dksih/QBM/2013/8/1/1573674405421056/1573674411810816/STEM/77c76dccb428452ea3c93bacaaf1611a.png)
(1)求此二次函数的解析式;
(2)求证:以C、D、E、F为顶点的四边形CDEF是平行四边形;
(3)在抛物线上是否存在这样的点P,使四边形CDEF为矩形?若存在,请求出所有符合条件的P点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccf5b79b55260f4d7a158afef730358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5c9977d56a4056ce616f1693109a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2013/8/1/1573674405421056/1573674411810816/STEM/77c76dccb428452ea3c93bacaaf1611a.png)
(1)求此二次函数的解析式;
(2)求证:以C、D、E、F为顶点的四边形CDEF是平行四边形;
(3)在抛物线上是否存在这样的点P,使四边形CDEF为矩形?若存在,请求出所有符合条件的P点坐标;若不存在,请说明理由.
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