如图,二次函数的图象与x轴交于
,
两点,与y轴交于点C,顶点为D.O为坐标原点,
.
(2)求四边形
的面积;
(3)P是抛物线上的一点,且在第一象限内,若
,求P点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe2c124d5bbbbe666ee145cd454b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c68a2a3d158a9de2d8f599d8c96ee20.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
(3)P是抛物线上的一点,且在第一象限内,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a9f5af4b4196369d2685386b231b2a.png)
2023·湖南常德·中考真题 查看更多[7]
2023年湖南省常德市中考数学真题 (已下线)XDRzkgssxzw940(已下线)专题11 二次函数-学易金卷:三年(2021-2023)中考数学真题分项汇编(湖南专用)(已下线)专题12 函数综合-学易金卷:三年(2021-2023)中考数学真题分项汇编(湖南专用)2024年中考数学模拟预测题五(已下线)重难点04 二次函数综合(7大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(上海专用)(已下线)专题10 二次函数与几何问题(一)(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)
更新时间:2023-06-28 15:21:20
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解答题-问答题
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【推荐1】在平面直角坐标系中,抛物线交
轴于
两点,交
轴于点
,已知抛物线的对称轴为
.
![](https://img.xkw.com/dksih/QBM/2012/2/5/1573336343650304/1573336397774848/STEM/5644f92e28c84a6ca0e8957ccc11bc85.png?resizew=189)
⑴求这个抛物线的解析式;
⑵在抛物线的对称轴上是否存在一点
,使点
到A、C两点间的距离之和最大.若存在,求出点
的坐标;若不存在,请说明理由.
(3)如果在
轴上方平行于
轴的一条直线交抛物线于
两点,以
为直径作圆恰好与
轴相切,求此圆的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c72229b08c676c08a3c7258895375f2.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/c41e58d7c5875f5ac138b97730976885.png)
![](https://img.xkw.com/dksih/QBM/2012/2/5/1573336343650304/1573336397774848/STEM/5644f92e28c84a6ca0e8957ccc11bc85.png?resizew=189)
⑴求这个抛物线的解析式;
⑵在抛物线的对称轴上是否存在一点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
(3)如果在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c2c469e50b231ff7667fbc96c19ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图所示,直线
与x轴交于点B,与y轴交于点C,抛物线
经过B,C两点,与x轴另一交点为A.点P以每秒
各单位长度的速度在线段BC上由点B向点C运动(点P不与点B和点C重合),设运动时间为t秒,过点P作x轴垂线叫x轴于点D,交抛物线于点E,连结AE交BC于点Q.
(1)求抛物线的解析式;
(2)当
时求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e235d7dd12f948f5ffb2e5afddc95612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)求抛物线的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2952126a66022e585b6e8fcbfe76a94d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852781358358528/2858191452512256/STEM/5ec7b1e9-0b95-4640-beed-39c23a600a74.png)
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【推荐1】在矩形
中,
,
,点
从点
出发,沿
边向点
以
的速度运动(不与点
重合),同时点
从点
出发沿
边向点
以
的速度运动(不与点
重合),如果
,
两点同时出发,运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/484ba534-7e6d-4b8a-ade7-5831d77a686f.png?resizew=85)
(1)用
表示线段
,
的长度;
(2)几秒种后,
的斜边
长
?
(3)设运动开始后第
秒钟后,五边形
的面积为
写出
与
的函数关系式,当
为何值时,
最小?最小值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35ed92397da56c7afbd6967597a9611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/484ba534-7e6d-4b8a-ade7-5831d77a686f.png?resizew=85)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(2)几秒种后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c076056906cd59f7c4f782a4db28d907.png)
(3)设运动开始后第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a9561c615656ef59fe37ea568a7367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ecfda698212594a342565257dc5508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】企业接到一批帽子生产任务,按要求在20天内完成,约定这批帽子的出厂价为每顶8元.为按时完成任务,该企业招收了新工人,设新工人小航第x天生产的帽子数量为y顶,y与x满足如下关系式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d696f2d3ea3a1dc26ec7b7a352c69c57.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989280723329024/2992543179309056/STEM/b4c7f485-9e47-4264-ab27-1797e7407e3e.png?resizew=196)
(1)小航第几天生产的帽子数量为220顶?
(2)如图,设第x天每顶帽子的成本是P元,P与x之间的关系可用图中的函数图像来刻画,若小航第x天创造的利润为w元,求w与x之间的函数表达式,并求出第几天的利润最大?最大值是多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d696f2d3ea3a1dc26ec7b7a352c69c57.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989280723329024/2992543179309056/STEM/b4c7f485-9e47-4264-ab27-1797e7407e3e.png?resizew=196)
(1)小航第几天生产的帽子数量为220顶?
(2)如图,设第x天每顶帽子的成本是P元,P与x之间的关系可用图中的函数图像来刻画,若小航第x天创造的利润为w元,求w与x之间的函数表达式,并求出第几天的利润最大?最大值是多少元?
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【推荐1】如图,在
中,
,以
为直径作半圆
,交
于点
,连接
,过点D作半圆O的切线交
于点E,交
的延长线于点F.
(2)若半圆O的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
(2)若半圆O的半径为5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ff4df71820671008d9f9062ef8b2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图,直角三角形ABC中,∠ABC=90°,以边AB为直径作圆O,交AC于点E,点D是BC的中点,连接DE
(1)判断DE与圆O的关系,说明理由;
(2)若AB=4,DE=
,点G是圆上出E、B外的任意一点,则∠EGB=______°(直接写出答案).
(1)判断DE与圆O的关系,说明理由;
(2)若AB=4,DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/602cd2e2-2ed4-4ecc-ac81-2dce5a6d5ffb.png?resizew=194)
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【推荐1】如图,已知抛物线
与
轴交于点
和点
,与
轴交于点
,连接
交抛物线的对称轴于点
,
是抛物线的顶点.
(2)直接写出点
和点
的坐标;
(3)若点
在第一象限内的抛物线上,且
,求
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.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/c5db41a1f31d6baee7c69990811edb9f.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/8455657dde27aabe6adb7b188e031c11.png)
(2)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beb48ad541c22b6e2224f25a0a1c096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】已知二次函数
过点A(1,0),B(-3,0),C(0,-3)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/a8cced1e-b682-41d4-9022-d3004d71dcd6.png?resizew=169)
(1)求二次函数的解析式;
(2)在抛物线的对称轴上求点F,使AF+CF最小,求点F的坐标.
(3)在抛物线上存在一点P使△ABP的面积为6,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac8b0eb4aa1cbe23125aa2f6d35337c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/a8cced1e-b682-41d4-9022-d3004d71dcd6.png?resizew=169)
(1)求二次函数的解析式;
(2)在抛物线的对称轴上求点F,使AF+CF最小,求点F的坐标.
(3)在抛物线上存在一点P使△ABP的面积为6,求点P的坐标.
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