名校
1 . 如图,抛物线
与双曲线
相交于点A、B,且抛物线经过坐标原点,点A在第二象限内,且点A到两坐标轴的距离相等,点B的坐标为
.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2946092465569792/2965612749979648/STEM/4f3cd1b5-a23d-4310-a451-9b8cc21b2b0d.png?resizew=271)
(1)求A的坐标及抛物线的解析式;
(2)若点E为A、B两点间的抛物线上的一点,试求
面积的最大值,并求出此时点E的坐标;
(3)过点B作直线
轴,点C为直线
与抛物线的另一交点.在抛物线上是否存在点D,使
的面积等于
的面积?若存在,请求出点D的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990a64c41f96ef4355bf4ae017143f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b02102fb7cdf423abb58fc1f0b43f12.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2946092465569792/2965612749979648/STEM/4f3cd1b5-a23d-4310-a451-9b8cc21b2b0d.png?resizew=271)
(1)求A的坐标及抛物线的解析式;
(2)若点E为A、B两点间的抛物线上的一点,试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(3)过点B作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70c93718be1e6197b7783d62c963ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2022-04-25更新
|
251次组卷
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2卷引用:2022年云南省昆明市第十中学九年级下学期第一次诊断数学试题(一模)
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2 . 如图所示,在平面直角坐标系
中,已知二次函数
的图象与x轴交于点
,与y轴交于点B.
(1)求该函数的表达式及顶点坐标;
(2)将该二次函数图象在点A,B之间的部分(含A,B两点)记为图象W,点Q在图象W上,连接QA,QB,求
面积的最大值;
(3)点P(m,n)在该二次函数图象上,当
时,该二次函数有最大值2,请根据图象求出m的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220f77f8740bcde0dfaa3b51b16f775d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f34ae92ed34d6a0294ee7e68796fc4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/0dbe743d-c946-421a-b7e8-dadf473c7fc9.png?resizew=202)
(1)求该函数的表达式及顶点坐标;
(2)将该二次函数图象在点A,B之间的部分(含A,B两点)记为图象W,点Q在图象W上,连接QA,QB,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
(3)点P(m,n)在该二次函数图象上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2198978baa5a994212ecd40c2a6ad351.png)
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3 . 如图,在平面直角坐标系中,点A,B的坐标分别为(6,6),(6,0),抛物线y=﹣(x﹣m)2+n的顶点P在折线OA﹣AB上运动.
(1)当点P在线段OA上运动时,抛物线y=﹣(x﹣m)2+n与y轴交点坐标为(0,c).
①用含m的代数式表示n,
②求c的取值范围.
(2)当抛物线y=﹣(x﹣m)2+n经过点B时,求抛物线所对应的函数表达式;
(3)当抛物线与△ABO的边有三个公共点时,直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/64a8ae87-4d3f-4e21-943b-85019503283a.png?resizew=184)
(1)当点P在线段OA上运动时,抛物线y=﹣(x﹣m)2+n与y轴交点坐标为(0,c).
①用含m的代数式表示n,
②求c的取值范围.
(2)当抛物线y=﹣(x﹣m)2+n经过点B时,求抛物线所对应的函数表达式;
(3)当抛物线与△ABO的边有三个公共点时,直接写出点P的坐标.
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2019-09-16更新
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3卷引用:云南省曲靖市麒麟区第六中学2023-2024学年上学期九年级第三次月考数学试题
名校
4 . 如图所示,在平面直角坐标系中,抛物线经过
,
,
.
(1)求抛物线的解析式;
(2)该抛物线上有一点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4e5bf2fc46de6d148602f505614c4e.png)
不与点
、
、
重合
,使得
,求点
的坐标;
(3)点
是线段
上的动点
不与点
、点
重合
,过点
作
轴交抛物线于点
,求线段
的最大值及此时
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4129098ad406f5d89c02c3b1c4b905d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/b903a07d-e1c6-44e5-82eb-e94521fdee95.png?resizew=393)
(1)求抛物线的解析式;
(2)该抛物线上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4e5bf2fc46de6d148602f505614c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fd08c188ce82b6a0074a755246badd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.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/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989cef39186a792f65ee5dbc18082fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be602a29cad9e1fb71072174e77eaf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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5 . 如图,在边长为
的正方形
中,点
,
,
,
分别从点
,
,
,
同时出发,均以
的速度向点
,
,
,
匀速运动,当点
到达点
时,四个点同时停止运动,在运动过程中,当运动时间为________
时,四边形
,的面积最小,其最小值是________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65502a7ea4d1ce6d6d8c720845c73e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/97b1034f-1853-4e1f-9040-bc61fa26805b.jpg?resizew=121)
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6 . 综合与探究
如图1,二次函数
的图象与
轴交于
,
(点
在点
的左侧)两点,与
轴交于点
.直线
经过
,
两点,连接
.
(2)在抛物线上是否存在除点
外的点
,使得
?若存在,请求出此时点
的坐标;若不存在,请说明理由.
(3)如图2,将
沿
轴正方向平移得到
(点A,O,C的对应点分别为
,
,
),
,
分别交线段
于点E,F,当
与
的面积相等时,请直接写出
与
重叠部分的面积.
如图1,二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114da91d9b7124b283b3edcd50daf60d.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/f590ca2bde213675bffe68ed4017f957.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)在抛物线上是否存在除点
![](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/38397641e807f6b2286ecf8e5bebc095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab206477d4305b2b7f3bd7a7040bd5c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd36eaf776b9c76e6a5b13d7953c6399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e642f209374b934bd85c61f135b6a4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c8d46d5444746abfea21ab5cfcb55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab206477d4305b2b7f3bd7a7040bd5c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
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2024-03-22更新
|
107次组卷
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3卷引用:专题11 二次函数与几何问题(二)(六大热点题型归纳)-2024年中考数学二轮热点题型归纳与变式演练(云南专用)
(已下线)专题11 二次函数与几何问题(二)(六大热点题型归纳)-2024年中考数学二轮热点题型归纳与变式演练(云南专用) 2024年山西省朔州市多校中考一模数学试题2024山西省中考模拟卷数学试题3
7 . 如图,已知抛物线
与
轴相交于点
,
,与
轴的交点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/d7d092e4-d85a-465f-938a-868e6889420b.png?resizew=140)
(1)求抛物线的解析式;
(2)点
在平面直角坐标系第一象限内的抛物线上运动,设
的面积为S,求S关于
的函数表达式
指出自变量
的取值范围
和S的最大值;
(3)点
在抛物线上运动,点
在
轴上运动,是否存在点
、点
使得∠CMN=90°,且
与
相似,如果存在,请求出点
和点
的坐标.
![](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/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/859bf9cae1ba707d53066042073251f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/d7d092e4-d85a-465f-938a-868e6889420b.png?resizew=140)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(3)点
![](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/d053b14c8588eee2acbbe44fc37a6886.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/ba4e0b69a99a550d90722d4919cb13e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa4915684d5762408c15f778fde5d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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8 . 如图,已知抛物线
的对称轴为直线
,抛物线与x轴相交于A,B两点,点A在点B的左侧,点
为抛物线与y轴的交点.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712443622391808/2725962290216960/STEM/6271a933-20a0-4aa2-b9cf-6bbdfa5b20d8.png)
(1)求b和c的值.
(2)在抛物线的对称轴上存在一点P,使
最短,请求出点P的坐标.
(3)抛物线上是否存在一点Q,使
的面积等于
的面积的4倍?若存在,求出点Q所有的坐标;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/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5abc4464f8c0424a6c896617321757.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712443622391808/2725962290216960/STEM/6271a933-20a0-4aa2-b9cf-6bbdfa5b20d8.png)
(1)求b和c的值.
(2)在抛物线的对称轴上存在一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d1d99eab930cef884e01b97d4d56f1.png)
(3)抛物线上是否存在一点Q,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3faf1d410de2300a23a33d89afe603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
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名校
9 . 如图,抛物线
交
轴于A,B两点,交
轴于点
,
是第一象限内抛物线上的一个动点.
(1)求点A,B,C的坐标;
(2)求
面积的最大值;
(3)将
绕点
顺时针旋转
后,点
落在点
的位置,将抛物线沿
轴平移后经过点
,求平移后所得抛物线的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91265eb2261b796fc204757eca5466dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/436aab0e-1c43-4860-b2ae-95c50584e58d.png?resizew=143)
(1)求点A,B,C的坐标;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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2023-11-03更新
|
92次组卷
|
2卷引用:云南省昆明市呈贡区第三中学2023-2024学年九年级上学期期中数学试题
解题方法
10 . 如图,在平面直角坐标系中,抛物线交y轴于
点,交x轴于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/606dc008-af0b-443b-bf7c-1496a1b7295a.png?resizew=207)
(1)求此抛物线的解析式;
(2)已知点P是抛物线上的一个动点,且位于A、C两点之间,问:当点P运动到什么位置时,
的面积最大?并求出此时P点的坐标和
的最大面积;
(3)过点B作线段
的垂线交抛物线于点D,如果以点C为圆心的圆与直线
相切,请判断抛物线的对称轴l与
有怎样的位置关系,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af9c5931ec7880e5c2706fd449a7d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d6f915ff3eadb4dd0d8e2379d9a7a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/606dc008-af0b-443b-bf7c-1496a1b7295a.png?resizew=207)
(1)求此抛物线的解析式;
(2)已知点P是抛物线上的一个动点,且位于A、C两点之间,问:当点P运动到什么位置时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
(3)过点B作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
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