1 . 如图①,抛物线
与x轴交与
、
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/1d04001f-7b05-477f-aa76-15e433d3c602.png?resizew=292)
(1)求该抛物线的解析式;
(2)设抛物线与y轴交于C点,在该抛物线的对称轴上是否存在点Q.使得
的周长最小?若存在,求出Q点的坐标;若不存在,请说明理由.
(3)若点M从B点以每秒
个单位长度沿BA方向向点A运动,同时,点N从C点以每秒
个单位沿
方向向点B运动.设运动时间为t秒,当t为何值,以B,M,N为顶点的三角形与
相似?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0408eddf4564e37a4666ba1e524cb8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b10741192165dcf39a998eb3cce302.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/1d04001f-7b05-477f-aa76-15e433d3c602.png?resizew=292)
(1)求该抛物线的解析式;
(2)设抛物线与y轴交于C点,在该抛物线的对称轴上是否存在点Q.使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
(3)若点M从B点以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48acde54fd48fbf883406e30972a07d.png)
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解题方法
2 . 如图,在平面直角坐标系中,抛物线
与x轴交于点
,与y轴交于点C,点D为
的中点.
(2)点G是该抛物线对称轴上的动点,若
有最小值,求此时点G的坐标;
(3)若点P是第四象限内该抛物线上一动点,求
面积的最大值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e1102d7ce8e59b86975f4a2512861e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点G是该抛物线对称轴上的动点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508015b3096bf9ccbc9b2ee70284f911.png)
(3)若点P是第四象限内该抛物线上一动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7f9f7952c4be18cb73393047c2ad75.png)
您最近一年使用:0次
2023-02-28更新
|
371次组卷
|
7卷引用:山东省济南市章丘区2022-2023学年九年级上学期期末数学试题
3 . 如图,抛物线
与x轴交于
,
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/2817cf32-06dc-4ad4-8f1d-29b0e2ee2ec0.png?resizew=231)
(1)求该抛物线的解析式;
(2)若抛物线交y轴于C点,在该抛物线的对称轴上是否存在点Q,使得
的周长最小?若存在,求出Q点的坐标;若不存在,请说明理由.
(3)在抛物线的第二象限图像上是否存在一点P,使得
的面积最大?若存在,求出点P的坐标及
的面积最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee07d86765c4fb74ac647742f16bd57c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/2817cf32-06dc-4ad4-8f1d-29b0e2ee2ec0.png?resizew=231)
(1)求该抛物线的解析式;
(2)若抛物线交y轴于C点,在该抛物线的对称轴上是否存在点Q,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
(3)在抛物线的第二象限图像上是否存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
您最近一年使用:0次
2023-02-23更新
|
411次组卷
|
9卷引用:山东省东营市河口区实验学校2022-2023学年九年级上学期期中数学试题
山东省东营市河口区实验学校2022-2023学年九年级上学期期中数学试题山东省淄博市临淄区2021-2022学年九年级上学期期末数学试题山东省东营市垦利区2020-2021学年九年级上学期期末数学试题重庆市永川区2021-2022学年九年级上学期期末数学试题四川省泸州市合江县2022-2023学年九年级上学期期中数学试题山东省东营市东营经济技术开发区2022-2023学年八年级下学期期末数学试题河南省部分学校2021-2022学年九年级上学期第一次阶段性测试数学试题河北省邯郸市曲周县2022-2023学年九年级上学期期末数学试题(已下线)专题03 二次函数的最值与存在性问题(20题)-【帮课堂】2023-2024学年九年级数学上册同步学与练(人教版)
4 . 如图,已知抛物
与轴交于
,
两点,与y轴交于点C,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/f079e049-1f43-48bb-a2c5-d4cf2d39c4d1.png?resizew=206)
(1)求抛物线的解析式;
(2)若点P为线段
上的一动点(不与B、C重合),
轴,且交抛物线于点M,交x轴于点N,求
的面积的最大值;
(3)若点D为抛物线的顶点,在y轴上是否存在点E,使E到点B的距离与点E到点D的距离之差最大?若存在,请直接写出点E的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/f079e049-1f43-48bb-a2c5-d4cf2d39c4d1.png?resizew=206)
(1)求抛物线的解析式;
(2)若点P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9a8ae6c15072d8ae52b43c8edd9cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
(3)若点D为抛物线的顶点,在y轴上是否存在点E,使E到点B的距离与点E到点D的距离之差最大?若存在,请直接写出点E的坐标;若不存在,请说明理由.
您最近一年使用:0次
5 . 如图,抛物线
与
轴交于
、
两点,与
轴交于
点,
,
,连接
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/ea3e1876-397d-442c-907b-893dc013688d.png?resizew=264)
(1)求抛物线的解析式;
(2)在抛物线对称轴上是否存在一点
使得
的周长最小,若存在,请求出
点坐标,若不存在,请说明理由;
(3)若点
是
轴上的动点,在坐标平面内是否存在点
,使以点
、
、
、
为顶点的四边形是菱形?若存在,请 直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63447ea996b9036a7a7ae726cc382cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/ea3e1876-397d-442c-907b-893dc013688d.png?resizew=264)
(1)求抛物线的解析式;
(2)在抛物线对称轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/5963abe8f421bd99a2aaa94831a951e9.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
2023-02-06更新
|
178次组卷
|
2卷引用:山东省德州市德城区第九中学2022-2023学年九年级上学期第一次月考数学试题
名校
6 . 如图,已知抛物线与x轴相交于A、B两点,与y轴相交于点C,若已知A点的坐标为
.
(1)求抛物线的解析式;
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)在抛物线的对称轴上是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
您最近一年使用:0次
2023-02-03更新
|
236次组卷
|
3卷引用:2022年山东省菏泽市重点中学中考数学模拟预测试卷
7 . 如图,在平面直角坐标系中,
为等腰直角三角形,
,抛物线
经过A,B两点,其中点A,C的坐标分别为
,
,抛物线的顶点为点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/43c6fdb6-0eee-4acb-bf44-dc1044401afd.png?resizew=190)
(1)求抛物线的解析式;
(2)点E是直角
斜边
上的一个动点(不与A,B重合),过点E作x轴的垂线,交抛物线于点F,当线段
的长度最大时,求点E的坐标;
(3)在(2)的条件下,抛物线上是否存在一点P,使
是以
为直角边的直角三角形?若存在,直接写出所有点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2f59980057f51e5cf3e86038cfaa16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/43c6fdb6-0eee-4acb-bf44-dc1044401afd.png?resizew=190)
(1)求抛物线的解析式;
(2)点E是直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
(3)在(2)的条件下,抛物线上是否存在一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
8 . 如图,抛物线
与 x 轴交于 A,B 两点,且
,与 y 轴交
于点 C,连接
,抛物线对称轴为直线
, D 为第一象限内抛物线上一动点,过点 D 作
于点 E,与
交于点 F,设点 D 的横坐标为 m.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/18320c24-2ca4-4086-8ee9-913e34713a7a.png?resizew=273)
(1)求抛物线的表达式;
(2)在抛物线的对称轴上是否存在点P,使得
的周长最小?若存在,求点P的坐标;
(3)在抛物线上是否存在点 D,使得
的面积最大,若存在,求出 m 的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3abef063e1692494fd4769d100f044b8.png)
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145559524769792/3161266885246976/STEM/02e01ccbe5d5461f8c6eccaa50f4398e.png?resizew=7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a179d6628345ad3442d2431d72f352a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504cf35247693ceb766c3b85a4ab2a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/18320c24-2ca4-4086-8ee9-913e34713a7a.png?resizew=273)
(1)求抛物线的表达式;
(2)在抛物线的对称轴上是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
(3)在抛物线上是否存在点 D,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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9 . 如图,一次函数
分别交y轴、x轴于A、B两点,抛物线
过A、B两点.
![](https://img.xkw.com/dksih/QBM/2023/1/3/3145058443501568/3161177660530688/STEM/78774887d5bd47c8867bee1ae7d4c2a4.png?resizew=241)
(1)求这个抛物线的解析式;直接写出当
时x的取值范围.
(2)作垂直x轴的直线
,在第一象限交直线
于M,交这个抛物线于N.求当t取何值时,
有最大值?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd16e4d35a1da3f1a6cccbfb75a2ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68160bded73fe9c0dd6f54034f5632d4.png)
![](https://img.xkw.com/dksih/QBM/2023/1/3/3145058443501568/3161177660530688/STEM/78774887d5bd47c8867bee1ae7d4c2a4.png?resizew=241)
(1)求这个抛物线的解析式;直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
(2)作垂直x轴的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
10 . 如图,这是某次运动会开幕式上点燃火炬时在平面直角坐标系中的示意图,在地面有
,
两个观测点,分别测得目标点火炬
的仰角为
,
,
米,
,
.可用位于点
正上方2米处的发射装置(
点),向目标
发射一个火球点燃火炬,该火球运行的轨迹为一抛物线,当火球运行到距地面最大高度20米时,相应的水平距离为12米(图中
点).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/b5cbb68d-f36f-42c3-a070-ac82a5daf681.png?resizew=193)
(1)求火球运行轨迹的抛物线对应的函数表达式.
(2)说明按(1)中轨迹运行的火球能否点燃目标
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb85d8e20e24d4adca709886c1ff0df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f8ea3ce97d0bb839ed8004a607e28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/b5cbb68d-f36f-42c3-a070-ac82a5daf681.png?resizew=193)
(1)求火球运行轨迹的抛物线对应的函数表达式.
(2)说明按(1)中轨迹运行的火球能否点燃目标
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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