已知:如图,一次函数y=kx﹣1的图象经过点A(3
,m)(m>0),与y轴交于点B,点C在线段AB上,且BC=2AC,过点C作x轴的垂线,垂足为点D.若AC=CD.
(1)求这个一次函数的表达式;
(2)已知一开口向下、以直线CD为对称轴的抛物线经过点A,它的顶点为P,若过点P且垂直于AP的直线与x轴的交点为Q(﹣
,0),求这条抛物线的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(1)求这个一次函数的表达式;
(2)已知一开口向下、以直线CD为对称轴的抛物线经过点A,它的顶点为P,若过点P且垂直于AP的直线与x轴的交点为Q(﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98ee8ce2c56dccae6b63b5a9ca022b8.png)
![](https://img.xkw.com/dksih/QBM/2018/7/7/1983277003096064/1985022512676864/STEM/e74591f865e34a11bb2e9af84b82f458.png?resizew=122)
2018·江苏无锡·中考真题 查看更多[1]
更新时间:2018-07-09 22:41:33
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相似题推荐
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
.
(1)当抛物线过点
时,求抛物线的表达式;
(2)求这个二次函数的顶点坐标(用含m的式子表示);
(3)若抛物线上存在两点
和
,其中
.当
时,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960af4d171aca1b6bff4d7613c7c63ee.png)
(1)当抛物线过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
(2)求这个二次函数的顶点坐标(用含m的式子表示);
(3)若抛物线上存在两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ae8145585f54463abe2d8c001db226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b5ebdf14bd72d1693ebb5fca0411f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4109c31ed57bb1431ac0d80e30aa32.png)
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【推荐2】如图,在平面直角坐标系
中,抛物线
经过点
和
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/5a0680d5-8821-47f8-b1c0-bcbbaaa59f2c.png?resizew=213)
(1)求这个抛物线的表达式;
(2)如果点D是抛物线位于第三象限上一点,
交x轴于点E,且E为
的中点.
①求D点坐标;
②点P在x轴上,如果
,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ea6b5f801158380a615c3f99f615e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/5a0680d5-8821-47f8-b1c0-bcbbaaa59f2c.png?resizew=213)
(1)求这个抛物线的表达式;
(2)如果点D是抛物线位于第三象限上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①求D点坐标;
②点P在x轴上,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ee0dab72ef582d2f008266fe3ca74.png)
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【推荐3】在平面直角坐标系
中,已知二次函数
的图象与
轴交于
,
两点.如图
,在平面直角坐标系中,抛物线
(
)与
轴交于
,
两点(点
在点
的左侧),与
轴交于点
,点
,连接
.
![](https://img.xkw.com/dksih/QBM/2023/3/3/3186704994263040/3188720778567680/STEM/65095eeb718e40f883333d32cb6d61c9.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/fc9a0482-4bad-4801-8e33-1612ba732ae8.png?resizew=257)
(1)求抛物线的解析式;
(2)点
是线段
上一点,过点
作
轴,交抛物线于点
,交线段
于点
,点
是直线
上一点,连接
,
,当
的周长最大时,点
的坐标为
,
周长的最大值为______.
(3)如图2,已知
.将抛物线上下平移,设平移后的抛物线在对称轴右侧部分与直线
交于点
,连接
,当
是等腰三角形时,抛物线的平移距离d的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88856df184f4e8aef9e110fd99d1f6f3.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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.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/6c95963e8e4dcc511f0d86b1853ddcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2023/3/3/3186704994263040/3188720778567680/STEM/65095eeb718e40f883333d32cb6d61c9.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/fc9a0482-4bad-4801-8e33-1612ba732ae8.png?resizew=257)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0012c7c51b621b96d2186ac7d0dfafa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65dc56950b17bd316c5d502413546c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836f2cd7c1bf45a865b7d6bcb3e8f2d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65dc56950b17bd316c5d502413546c9c.png)
(3)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c87dde0d09e5ed8cd9218867b34e70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef1f7b9adab87736321e30949a4d668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8bd01cd837bc582032269ea383200b1.png)
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解题方法
【推荐1】我们把一个半圆与抛物线的一部分合成的封闭图形称为“蛋圆”.如图所示,点
、
、
、
分别是“蛋圆”与坐标轴的交点,已知点
的坐标为
,
为半圆的直径,半圆圆心
的坐标为
,半圆半径为
.
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827624990040064/2830109787357184/STEM/d7dcf0c9-2d5c-4ff1-9713-45a73ecf2bd9.png)
(1)求“蛋圆”抛物线部分的解析式及“蛋圆”的弦
的长;
(2)已知点
是“蛋圆”上的一点(不与点
,点
重合),点
关于
轴的对称点是点
,若点
也在“蛋圆”上,求点
坐标;
(3)点
是“蛋圆”外一点,满足
,当
最大时,直接写出点
的坐标.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827624990040064/2830109787357184/STEM/d7dcf0c9-2d5c-4ff1-9713-45a73ecf2bd9.png)
(1)求“蛋圆”抛物线部分的解析式及“蛋圆”的弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf3a9bc2daab1f386ec116d74b703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图抛物线
的对称轴为
,对称轴与
轴交于点
,抛物线与
轴交于点
,点
为抛物线上的两个动点,且点
在点
的右侧,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/ae8f58c2-dbb1-4f8f-be44-bbec24c8473b.png?resizew=232)
(1)求该抛物线的函数表达式及线段
的长;
(2)当点
与点
重合时,直接写出点
的坐标;
(3)当点
不与点
重合时,且
与(2)中的
相似时,请直接写出点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a96ddf66d169340695f05611fc5187f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.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/357d9412cb6b277a3e317d99135ab64b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/ae8f58c2-dbb1-4f8f-be44-bbec24c8473b.png?resizew=232)
(1)求该抛物线的函数表达式及线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4a514e2e338c6fa31c9938624a4a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4a514e2e338c6fa31c9938624a4a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解题方法
【推荐1】如图,在直角梯形AOCB中,AB∥OC,∠AOC=90°,AB=1,AO=2,OC=3,以O为原点,OC、OA所在直线为轴建立坐标系.抛物线顶点为A,且经过点C.点P在线段AO上由A向点O运动,点O在线段OC上由C向点O运动,QD⊥OC交BC于点D,OD所在直线与抛物线在第一象限交于点E.
![](https://img.xkw.com/dksih/QBM/2013/9/12/1573682583314432/1573682588835840/STEM/b2c7d0ce335c45da8f5196f754b06c22.png?resizew=242)
(1)求抛物线的解析式;
(2)点E′是E关于y轴的对称点,点Q运动到何处时,四边形OEAE′是菱形?
(3)点P、Q分别以每秒2个单位和3个单位的速度同时出发,运动的时间为t秒,当t为何值时,PB∥OD?
![](https://img.xkw.com/dksih/QBM/2013/9/12/1573682583314432/1573682588835840/STEM/b2c7d0ce335c45da8f5196f754b06c22.png?resizew=242)
(1)求抛物线的解析式;
(2)点E′是E关于y轴的对称点,点Q运动到何处时,四边形OEAE′是菱形?
(3)点P、Q分别以每秒2个单位和3个单位的速度同时出发,运动的时间为t秒,当t为何值时,PB∥OD?
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【推荐2】如图,在
中,
,
,
,点P从点A出发,以每秒5个单位的速度沿
向终点C匀速运动.当点P不与点A、C重合时,过点P作
交
于点Q,以
为边向上作正方形
,设正方形
与
重叠部分面积为S(平方单位),点P的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/e3438c62-da03-491a-9cf2-f258ce49379c.png?resizew=133)
(1)用含t的代数式表示线段
的长度为______;
(2)当点N落在线段
上时,求t的值;
(3)求S与t之间的函数关系式;
(4)当点N恰好落在
的角平分线上时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/e3438c62-da03-491a-9cf2-f258ce49379c.png?resizew=133)
(1)用含t的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当点N落在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)求S与t之间的函数关系式;
(4)当点N恰好落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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