如图1,抛物线
与x轴交于点
,与y轴交于点C,点P为x轴上方抛物线上的动点,点F为y轴上的动点,连接PA,PF,AF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/93d2d246-cf1c-41df-9258-bba84589c65d.png?resizew=336)
(1)求该抛物线所对应的函数解析式;
(2)如图1,当点F的坐标为
,求出此时△AFP面积的最大值;
(3)如图2,是否存在点F,使得△AFP是以AP为腰的等腰直角三角形?若存在,求出所有点F的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217db82fb4ad09b89ccac74e2745c28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852a0a78652fe92a0169c24c2961fa56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/93d2d246-cf1c-41df-9258-bba84589c65d.png?resizew=336)
(1)求该抛物线所对应的函数解析式;
(2)如图1,当点F的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f1698e19a176c910ffd4881a2aaf5d.png)
(3)如图2,是否存在点F,使得△AFP是以AP为腰的等腰直角三角形?若存在,求出所有点F的坐标;若不存在,请说明理由.
2022·海南省直辖县级单位·二模 查看更多[10]
2022年海南省琼海市九年级下学期义务教育阶段教学质量监测(二模)数学试题(已下线)第18讲 二次函数中特殊几何图形存在性(探究性)问题-【暑假自学课】2022年新九年级数学暑假精品课(人教版)浙江省温州市第十二中学2022-2023学年九年级上学期9月月考数学试题山东省滨州市无棣县2022-2023学年九年级上学期期中数学试题浙江省嘉兴市桐乡市求是实验中学2022-2023学年九年级上学期期中数学试题(已下线)题型六 函数与几何图形动态探究题广东省中山市八校联考2022-2023学年九年级下学期3月月考数学试卷云南省昆明市盘龙区黄冈中学2022-2023学年九年级上学期期中考试数学试卷广东省梅州市丰顺县潭江中学2022-2023学年九年级下学期开学考试数学试题湖南省长沙市雅礼实验中学2022-2023学年九年级上学期开学考试数学试题
更新时间:2022-10-19 10:05:08
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解答题-问答题
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名校
【推荐1】如图,二次函数
图象交坐标轴于点
,
.点
为线段
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/da17ed50-4fcf-4526-8496-e666f661de57.png?resizew=182)
(1)求二次函数的解析式及顶点坐标;
(2)过点
作
轴分别交线段
、抛物线于点
和点
,求线段
的最大值及此时
的面积;
(3)当
取最小值时,求此时点
的坐标及:
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298b7ec6eac30c0545bcadd7cc9755d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6bbbb53aaeab0ab7a242228cc510fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1bf75102d42949ac25e0b87c9ec2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/da17ed50-4fcf-4526-8496-e666f661de57.png?resizew=182)
(1)求二次函数的解析式及顶点坐标;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a94436893a74f5a3a731256c8773ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3730e2fa70360e60286cff11b37c3051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740d0912f20a8b5281f82b0335a2de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740d0912f20a8b5281f82b0335a2de.png)
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【推荐2】如图1,抛物线
与x轴交点为A,B(A在B左侧),与y轴交点为C,已知
.
(2)如图2,D为抛物线顶点,E为射线
上的动点,过点E作
,交直线
于点F,若
面积为2,求点E坐标;
(3)如图3,点P是第一象限内抛物线上一动点,直线
关于直线
的对称直线交抛物线于点Q,过点A作平行于y轴的直线l,点P,Q到直线l的垂线段分别为
,
,当点P在抛物线上运动时,
的值是否发生变化?如果不变,求出其值;如果变化,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53951b26aa0e9f889ccf73c3d68c071c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
(2)如图2,D为抛物线顶点,E为射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c851c07c6e4b9a66e76168d6b16592e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)如图3,点P是第一象限内抛物线上一动点,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bdbbd3084ddc946e12d530d2192522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9009cd9d633179bc75787e2efd2dd588.png)
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解答题-证明题
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【推荐1】已知平行四边形
,E为
边上的中点,F为
边上的一点,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/427e9ab8-0a7d-4fd0-9a78-677974cb1623.png?resizew=497)
(1)如图1,连接
并延长交
的延长线于点G,求证:
;
(2)如图2,若
,
,求
;
(3)如图3,若
,P为
的中点,Q为
的中点,
,
,
①判断
与
的位置关系,并说明理由;
②求
.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/427e9ab8-0a7d-4fd0-9a78-677974cb1623.png?resizew=497)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4763d25d89038fd620543cebeb9b630b.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e195e21a4520c4ce130785171af56d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048982728a2204a2f78c3f186af4c07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cad196e55dbd13c45e11a51d700383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8adbc96bd4697ace4d9a318db350c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f403d7982e80e4b0a306e64e7e72fa0.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】(1)探索:如图①,四边形
中,
,过
作
于点
,
于点
,求
的面积.
(2)应用:如图②所示,点
为线段
外一动点,且
,分别以
为边,作等边三角形
和等边三角形
,点
分别为
的中点,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2445ed86b0c78e5b442c242b8780293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
(2)应用:如图②所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b415cf6392b861455b85900d5744d6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739b0b495580292bf7e0d6578665d37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf0959c79438d83888a2c532d121981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8bdf4426d13ebf937df0cbbec75064.png)
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【推荐1】如图1,在平面直角坐标系中,O是坐标原点.点A在x轴的正半轴上,点A的坐标为(10,0).一条抛物线
经过O,A,B三点,直线AB的表达式为
,且与抛物线的对称轴交于点Q.
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229573202845696/2230432452993024/STEM/c76cd5d778e54ba69d8f3db534a6ae1c.png?resizew=454)
(1)求抛物线的表达式;
(2)如图2,在A,B两点之间的抛物线上有一动点P,连结AP,BP,设点P的横坐标为m,△ABP的面积S,求出面积S取得最大值时点P的坐标;
(3)如图3,将△OAB沿射线BA方向平移得到△DEF,在平移过程中,以A,D,Q为顶点的三角形能否成为等腰三角形?如果能,请直接写出此时点E的坐标(点O除外);如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb22cd7e540ee9d759cff04f2756722.png)
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229573202845696/2230432452993024/STEM/c76cd5d778e54ba69d8f3db534a6ae1c.png?resizew=454)
(1)求抛物线的表达式;
(2)如图2,在A,B两点之间的抛物线上有一动点P,连结AP,BP,设点P的横坐标为m,△ABP的面积S,求出面积S取得最大值时点P的坐标;
(3)如图3,将△OAB沿射线BA方向平移得到△DEF,在平移过程中,以A,D,Q为顶点的三角形能否成为等腰三角形?如果能,请直接写出此时点E的坐标(点O除外);如果不能,请说明理由.
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【推荐2】已知抛物线
与x轴交于A、B两点,顶点为C,连接
,点P在线段
下方的抛物线上运动.
(1)如图1,连接
,
,若
,求点P的坐标.
(2)如图2,过点P作
轴交
于点Q,
交
于点H,求
周长的最大值.
(3)如图3,直线
,
分别与y轴交于点E,F,当点P运动时,
是否为定值?若是,试求出该定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c7b98cef133174cdadb9f9d87c0095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/c7f5d010-40ba-4f15-94b1-4e78e0f24e48.png?resizew=531)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c025a5105bf2aa3443c0badc06b8230.png)
(2)如图2,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef7eab528a8dd3e3f328de3b3ac80ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a84ca43baf937e49a9d06b1567ece94.png)
(3)如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc14ccbf98635ef5106ac257a38082ea.png)
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解答题-作图题
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真题
【推荐1】将一张三角形纸片ABC放置在如图所示的平面直角坐标系中,点A(﹣6,0),点B(0,2),点C(﹣4,8),二次函数y=ax2+bx+c(a≠0)的图象经过点A,B,该抛物线的对称轴经过点C,顶点为D.
(1)求该二次函数的表达式及点D的坐标;
(2)点M在边AC上(异于点A,C),将三角形纸片ABC折叠,使得点A落在直线AB上,且点M落在边BC上,点M的对应点记为点N,折痕所在直线l交抛物线的对称轴于点P,然后将纸片展开.
①请作出图中点M的对应点N和折痕所在直线l;(要求:尺规作图,不写作法,保留作图痕迹)
②连接MP,NP,在下列选项中:A.折痕与AB垂直,B.折痕与MN的交点可以落在抛物线的对称轴上,C.
=
,D.
=
,所有正确选项的序号是 .
③点Q在二次函数y=ax2+bx+c(a≠0)的图象上,当
PDQ∼
PMN时,求点Q的坐标.
(1)求该二次函数的表达式及点D的坐标;
(2)点M在边AC上(异于点A,C),将三角形纸片ABC折叠,使得点A落在直线AB上,且点M落在边BC上,点M的对应点记为点N,折痕所在直线l交抛物线的对称轴于点P,然后将纸片展开.
①请作出图中点M的对应点N和折痕所在直线l;(要求:尺规作图,不写作法,保留作图痕迹)
②连接MP,NP,在下列选项中:A.折痕与AB垂直,B.折痕与MN的交点可以落在抛物线的对称轴上,C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7541ace605f3573c2cfa72c21962b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7541ace605f3573c2cfa72c21962b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
③点Q在二次函数y=ax2+bx+c(a≠0)的图象上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/57624fd2-2ee5-47c1-a968-d6848081e812.png?resizew=220)
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【推荐2】如图1,抛物线
与
轴交于
,与
轴交于点
.
(2)若点
为抛物线第一象限内动点,求四边形
的面积的最大值;
(3)如图2,点
从点
出发,沿
的方向以每秒1个单位长度的速度向终点
运动,同时点
从
出发,以每秒1个单位长度的速度沿
的方向向终点
运动,当其中一个点到达终点时,另一点也随之停止运动,设运动时间为
秒.当
是直角三角形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c32afefeeabbf4f967f61d90d40007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2337f3f2678b04fed029b15ec53cfad9.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45587b6fbf112623de9715a088a6a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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