如图,在平面直角坐标系中,抛物线
(b、c为常数)的顶点坐标为
,与x轴交于A、B两点(点A在点B左侧),与y轴交于点C,点C,点D关于x轴对称,连结
,作直线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/e0492428-a6f3-4f6c-892f-e84f2dff4731.png?resizew=176)
(1)求b、c的值;
(2)求点A、B的坐标;
(3)求证:
;
(4)点P在抛物线
上,点Q在直线
上,当以点C、D、P、Q为顶点的四边形为平行四边形时,直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949235656dd759bd5bb361bf16d013d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/e0492428-a6f3-4f6c-892f-e84f2dff4731.png?resizew=176)
(1)求b、c的值;
(2)求点A、B的坐标;
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0661913e974af48093c77c653a996.png)
(4)点P在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2024-03-18 22:22:24
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解答题-问答题
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【推荐1】如图,抛物线y=
x2+bx+c经过A(0,−2)、B(8,−2)两点,点C为抛物线的对称轴与x轴的交点,连接AC、AB.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947521969225728/2957039397847040/STEM/ac781fc6-86ba-4de3-9848-79ee366bbf27.png?resizew=192)
(1)求抛物线的函数表达式;
(2)点E在AB下方的抛物线上,过点E作EF⊥AB于点F,连接AE,是否存在点E,使得△AEF与△AOC相似?若存在,求出点E的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4756acc50c489cbef2305e4259c988c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947521969225728/2957039397847040/STEM/ac781fc6-86ba-4de3-9848-79ee366bbf27.png?resizew=192)
(1)求抛物线的函数表达式;
(2)点E在AB下方的抛物线上,过点E作EF⊥AB于点F,连接AE,是否存在点E,使得△AEF与△AOC相似?若存在,求出点E的坐标;若不存在,请说明理由.
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解答题-计算题
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【推荐2】如图,灌溉车为绿化带浇水,喷水口
离地竖直高度
为
.可以把灌溉车喷出水的上、下边缘抽象为平面直角坐标系中两条抛物线的部分图像;把绿化带横截面抽象为矩形
,其水平宽度
,竖直高度
.下边缘抛物线是由上边缘抛物线向左平移得到,上边抛物线最高点
离喷水口的水平距离为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
,高出喷水口![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f58f972afae04bbc4549a79efa23aa.png)
,灌溉车到绿化带的距离
为
(单位:
)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(1)求上边缘抛物线的函数解析式,并求喷出水的最大射程
;
(2)通过计算说明点
到点
的距离和点
到点
的距离哪个更长;
(3)要使灌溉车行驶时喷出的水能浇灌到整个绿化带,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f090261333a1a126d3831f42748d48b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6244c4be2c661dc2166885d65bbad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aee9bc9b39025aa0924b8fee49b797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd30f3baa17444c83f21e59cb994f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f58f972afae04bbc4549a79efa23aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/93b6243a-9403-4a04-8ed2-0886604d5920.png?resizew=466)
(1)求上边缘抛物线的函数解析式,并求喷出水的最大射程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
(2)通过计算说明点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)要使灌溉车行驶时喷出的水能浇灌到整个绿化带,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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【推荐1】如图,点
在抛物线C:
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/69ebd17d-b936-4945-ab4b-c23fe4382bfa.png?resizew=127)
(1)直接写出抛物线C的解析式____________,顶点Q的坐标:__________.
(2)点
在抛物线C:
上,且在抛物线C的对称轴的右侧,求a的值;
(3)在坐标平面内放置一透明胶片,并在胶片上描画出点P及C的一段,分别记为
,平移该胶片,使
所在抛物线对应的解析式恰为
,求点
移动的最短路程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0d3b2998d9be4ec10e78ac4ecac58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af42281b2bce6e277bfa1b852f9818bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/69ebd17d-b936-4945-ab4b-c23fe4382bfa.png?resizew=127)
(1)直接写出抛物线C的解析式____________,顶点Q的坐标:__________.
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8547b084c872ff992aaff440473e326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af42281b2bce6e277bfa1b852f9818bb.png)
(3)在坐标平面内放置一透明胶片,并在胶片上描画出点P及C的一段,分别记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf8cae936d2a0daf860e3be0d73e673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c6ad41c132dfbea5264661e637691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
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【推荐2】已知抛物线
.
(1)若
,
,
,求该抛物线与
轴的交点坐标;
(2)若
,
且抛物线在
区间上的最小值是-3,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47fc74572c8dbb5ec99ab822ba673ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐1】如图,一条渔船某时刻在位置A观测灯塔B、C(灯塔B距离A处较近),两个灯塔恰好在北偏东65°45′的方向上,渔船向正东方向航行l小时45分钟之后到达D点,观测到灯塔B恰好在正北方向上,已知两个灯塔之间的距离是12海里,渔船的速度是16海里/时,又知在灯塔C周围18.6海里内有暗礁,问这条渔船按原来的方向继续航行,有没有触礁的危险?
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【推荐2】如图,Rt△ABC中,∠B=90°,AD平分∠BAC,E是AC上一点,以AE为直径作⊙O,若⊙O恰好经过点D.
(1) 求证:直线BC与⊙O相切;
(2)若BD=3,
,求⊙O的半径的长.
(1) 求证:直线BC与⊙O相切;
(2)若BD=3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5744683b1317e0867d21d96cc5e0adec.png)
![](https://img.xkw.com/dksih/QBM/2021/7/31/2776059568783360/2781875466199040/STEM/fae9fca1109841cfa37412e86513ea6a.png?resizew=166)
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【推荐1】在平面直角坐标系中,抛物线与
轴相交于点
,与
轴相交于点
,点
是该抛物线上一点,其横坐标为
,过点
作垂直于
轴的直线
,点
、
均在直线
上,且点
的横坐标为
,点
的横坐标为
,当点
、
不重合时,以
为边向下作正方形
.
(1)求该抛物线对应的函数解析式.
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cfd0530c5623a89ec6a6652a367e2e.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cfd0530c5623a89ec6a6652a367e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cfd0530c5623a89ec6a6652a367e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-作图题
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【推荐2】已知抛物线
且
为常数)的顶点为
,且经过两定点
,
(点
在点
的左侧).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/ccdc949a-d528-4e0f-a093-9510c01e2451.png?resizew=193)
(1)抛物线的对称轴:直线 ,顶点
的坐标: .(用含
的式子表示)
(2)求抛物线所经过的定点
,
的坐标.
(3)①若
是等腰直角三角形,请求出抛物线的解析式,并在如图所给定的平面直角坐标系中画出该抛物线;
②在①的条件下,若
为对称轴上一点,
为抛物线上一点,是否存在以
,
,
,
四点组成的平行四边形?若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeeff13d63f47671fc503d582119dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/ccdc949a-d528-4e0f-a093-9510c01e2451.png?resizew=193)
(1)抛物线的对称轴:直线 ,顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
(2)求抛物线所经过的定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
(3)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
②在①的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
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