如图,已知抛物线y=ax2+bx﹣3的图象与x轴交于点A(1,0)和点B(3,0),与y轴交于点C,D是抛物线的顶点,对称轴与x轴交于E.
(1)求抛物线的解析式;
(2)如图1,在抛物线的对称轴DE上求作一点M,使△AMC的周长最小,并求出点M的坐标和周长的最小值;
(3)如图2,点P是x轴上的动点,过P点作x轴的垂线分别交抛物线和直线BC于F、G.设点P的横坐标为m.是否存在点P,使△FCG是等腰三角形?若存在,求出m的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/b7576b7c-1d80-45b4-94e3-79e40bc55779.png?resizew=295)
(1)求抛物线的解析式;
(2)如图1,在抛物线的对称轴DE上求作一点M,使△AMC的周长最小,并求出点M的坐标和周长的最小值;
(3)如图2,点P是x轴上的动点,过P点作x轴的垂线分别交抛物线和直线BC于F、G.设点P的横坐标为m.是否存在点P,使△FCG是等腰三角形?若存在,求出m的值;若不存在,请说明理由.
20-21九年级上·广东肇庆·阶段练习 查看更多[9]
广东省肇庆市地质中学2020-2021学年九年级上学期第二次段考数学试题2021年江苏省常州市中考复习训练数学试题2021年湖南省资兴市中考数学2月份模拟试题(已下线)专题2.45 二次函数压轴题-特殊三角形问题(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)2021年河北省唐山市丰南区九年级一模考试数学试题2023年黑龙江省齐齐哈尔市甘南县西部六校联考中考一模数学试题(已下线)(挑战压轴)专项2.7 二次函数与等腰三角形有关问题-2022-2023学年九年级数学下册《同步考点解读·专题训练》(北师大版)(已下线)2021年河北中考数学一模二次函数应用、综合题湖北省荆州市江陵县2023-2024学年九年级上学期期末数学试题
更新时间:2020-12-10 23:04:33
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【推荐1】如图:在平面直角坐标系中,抛物线
经过A(﹣2,﹣4 ),O(0,0),B(2,0)三点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/a2d98cdc-7232-4634-8534-9e7087a10d95.png?resizew=203)
(1)求抛物线
的解析式和顶点坐标D.
(2)若使x轴上一点P,使P 到A、D的距离之和最小,求P的坐标.
(3)若抛物线对称轴上一点M,使AM + OM最小,求AM + OM的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/a2d98cdc-7232-4634-8534-9e7087a10d95.png?resizew=203)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)若使x轴上一点P,使P 到A、D的距离之和最小,求P的坐标.
(3)若抛物线对称轴上一点M,使AM + OM最小,求AM + OM的最小值.
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【推荐2】如图所示,抛物线与
轴交于点
两点,与
轴交于点
以
为直径作
过抛物线上一点
作
的切线
切点为
并与
的切线
相交于点
连结
并延长交
于点
连结![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9018a3ba5a789014362cb3533f848b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/ec1ecdf7-ef53-4328-ac14-ed5243745d29.png?resizew=269)
(1)求抛物线所对应的函数关系式及抛物线的顶点坐标;
(2)若四边形
的面积为
求直线
的函数关系式;
(3)抛物线上是否存在点
,使得四边形
的面积等于
的面积?若存在,求出点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1470b022f558bd0f04371011d41e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4614dd9d27db6f0cefc46675bd528ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647d6fb7606864d9c0757d7e003fe7e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78531a4083c9418c6e530cf5389755e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a08d7b0f3dc00e2a4643c98b8a1d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc7006190269d37225deb48248cb7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3ef894051e9c0f11b93d32a8a94bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9018a3ba5a789014362cb3533f848b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/ec1ecdf7-ef53-4328-ac14-ed5243745d29.png?resizew=269)
(1)求抛物线所对应的函数关系式及抛物线的顶点坐标;
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7bfcee99b2de794c0e333e1a4fa62a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8087f1de773294a13e236448f0cb9d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)抛物线上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7bfcee99b2de794c0e333e1a4fa62a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53bc503c97cf8b1e91df683f12df649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】在平面直角坐标系xOy中,抛物线y=ax2+bx+3与y轴交于点C,与x轴交于A,B两点(点A在点B的左侧),其中A(﹣2,0),并且抛物线过点D(4,3).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/a573fa12-20aa-403f-ad2b-bfb3cad24b60.png?resizew=505)
(1)求抛物线的解析式;
(2)如图1,点P为直线CB上方抛物线上一点,过P作PE∥y轴交BC于点E,连接CP,PD,DE,求四边形CPDE面积的最值及点P的坐标;
(3)如图2,将抛物线沿射线CB方向平移得新抛物线y=a1x2+b1x+c1(a1≠0),是否在新抛物线上存在点M,在平面内存在点N,使得以A,C,M,N为顶点的四边形为正方形?若存在,直接写出此时新抛物线的顶点坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/a573fa12-20aa-403f-ad2b-bfb3cad24b60.png?resizew=505)
(1)求抛物线的解析式;
(2)如图1,点P为直线CB上方抛物线上一点,过P作PE∥y轴交BC于点E,连接CP,PD,DE,求四边形CPDE面积的最值及点P的坐标;
(3)如图2,将抛物线沿射线CB方向平移得新抛物线y=a1x2+b1x+c1(a1≠0),是否在新抛物线上存在点M,在平面内存在点N,使得以A,C,M,N为顶点的四边形为正方形?若存在,直接写出此时新抛物线的顶点坐标,若不存在,请说明理由.
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【推荐2】在平面直角坐标系中,如果一个点的纵坐标等于它的横坐标的两倍,则称该点为“硬核点”例如
,
,
都是“硬核点”.
(1)下列说法正确的是_______(填序号).
①正比例函数
的图象上有无数个“硬核点”;
②一次函数
的图象上没有“硬核点”;
③反比例函数
的图象上有两个“硬核点”;
④二次函数
的图象上只有一个“硬核点”.
(2)已知抛物线
(
,
均为常数)上有且只有一个“硬核点”.
①当
时,求
的取值范围;
②当
时,过反比例函数
图象上的“硬核点”作平行于
轴的直线
,若抛物线上有四个点到直线
的距离为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a75aaf2b96de353cd12cc51f69e480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cca7c03f3e31a7cc195a554c1f39074.png)
(1)下列说法正确的是_______(填序号).
①正比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
②一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec89d17a1b8f7961e2f1f27c2d50685.png)
③反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d0516facb9339502ab01e716fde2a5.png)
④二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b629bea8e22de9bfc49158e2289871.png)
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc229acc8bf1a2047394bda863b1ea71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4271b4cff19c713d1d7f2a608507aa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,已知在平面坐标系中,点
的坐标为
,点
坐标为
,点
坐标为
,根据条件,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/d17658f5-33ff-42bf-b342-dd174513161d.png?resizew=494)
(1)如图1,求经过
三点的抛物线的解析式;
(2)如图2,设该抛物线的顶点为点
,求四边形
的面积;
(3)如图3,设点
是该抛物线对称轴上的一个动点,连接
,当
周长最小时,求点
的坐标,并求出此时
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c865504bae15a800afe6fa5b635d7820.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/d17658f5-33ff-42bf-b342-dd174513161d.png?resizew=494)
(1)如图1,求经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
(2)如图2,设该抛物线的顶点为点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
(3)如图3,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f644971a8b985186320630548c33ccad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
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【推荐2】平面直角坐标系中,点O是坐标原点,抛物线与y轴交于
,与x轴交于B、C两点(C在B的右侧),顶点坐标为
.
(2)点
是抛物线上一动点,且位于直线
的上方,过点
作
的垂线交
于点
,求
长度的最大值;
(3)在直线
上是否存在点G,使得
?若存在,请求出点G的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199fa9ced827133b386d16b8ce3e6ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e2a819e635258ddb57edf5a3167306.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1acc47f443e7ac8cfa925395ac414302.png)
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【推荐1】在平面直角坐标系中,点O为坐标原点,抛物线
与x轴交于点
,点P在抛物线上,且点P的横坐标为m.
(1)求该抛物线的函数表达式.
(2)当点P不与点O、A重合时,连结
.
①直接写出
的面积随m增大而增大时m的取值范围.
②当
时,求m的值.
(3)点P关于直线
的对称点为点Q,当
时,连结
,以
为边向下作正方形
,若抛物线与正方形
有3个公共点,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a68f930e2506101c84ff32ddcd3bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
(1)求该抛物线的函数表达式.
(2)当点P不与点O、A重合时,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432b11ef2c34039d87ee07d0b9dbf084.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7fbe8ed6bbceb5d1fad179bde4aa0c.png)
(3)点P关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f7586d669b22d6909db1ed05b074bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4e93cb32bf86f707a519c20260df5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
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【推荐2】在平面直角坐标系中,抛物线
的顶点为
,且该抛物线与
轴交于
、
两点(点
在点
的左侧).我们规定抛物线与
轴围成的封闭区域称为“区域
”(不包括边界);横、纵坐标都是整数的点称为整点.
(1)如果抛物线
经过点
.
①求
的值;
②直接写出“区域
”内整数点的个数;
(2)当
时,如果抛物线
在“区域
”内有4个整数点,求
的取值范围;
(3)当
时,抛物线与直线
交于点
,把点
向左平移5个单位长度得到点
,以
为边作等腰直角三角形
,使
,点
与抛物线的顶点始终在
的两侧,线段
与抛物线交于点
,当
时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae716e1168534de81763d2587257a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)如果抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10961ddd7001e0c3eb613286c6e6df8d.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②直接写出“区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b53b86bd516400d6fa7dabb3603f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eba7e2cb2e2390673b83bde332973d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b729706697b80542b38ff3bfab076cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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