二次函数
的图象经过点
,与y轴交于点C,点P为第二象限内抛物线上一点,连接
,交于点Q,过点P作
轴于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/7e56808a-f865-4050-9316-fc57e2de13a0.png?resizew=167)
(1)求二次函数的表达式;
(2)在对称轴上是否存在一个点M,使
的和最小,存在的话,请求出点M的坐标.不存在的话请说明理由.
(3)连接
,当
时,求直线
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e879263725e299745ff51d3c987ff7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c11ab7b6d8663a4be46317c2f7136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1ee4d562078c13aada38b2287201e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/7e56808a-f865-4050-9316-fc57e2de13a0.png?resizew=167)
(1)求二次函数的表达式;
(2)在对称轴上是否存在一个点M,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e211e1a1b43adc52e401350b26c9a16.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e6e205cdfa165a4ad441331eea1005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
更新时间:2024-03-19 23:45:26
|
相似题推荐
解答题-计算题
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【推荐1】如图,抛物线
的对称轴是直线
,与
轴相交于
,
两点,其中点
的坐标为
,且点
在抛物线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d6f38f5c-3f47-49f2-be4a-1bb2b1166905.jpg?resizew=246)
(1)求抛物线的解析式;
(2)点
为抛物线与
轴的交点,在对称轴直线
上找一点
,使得
的周长最小,求点
的坐标.
(3)点
是直线
上方抛物线一动点,不与点
重合,求点
坐标使
与
的面积相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1c84057882768f20a01365c81b6760.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/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663d94efcc8a8a4b5a3563e94eb8fbb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d6f38f5c-3f47-49f2-be4a-1bb2b1166905.jpg?resizew=246)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1c84057882768f20a01365c81b6760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
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名校
【推荐2】如图,
网格(每个小正方形的边长为1)中,有A,O,B,C,D,E,F,H,G九个格点,抛物线1的解析式为
.
(1)若1经过点
和
,则
;
(2)若l经过点
和
,求它的解析式及顶点坐标;通过计算说明点
是否在1上.
(3)若1经过这九个格点中的三个,直接写出所有满足这样的抛物线的条数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/308e8272-cdea-470a-a10a-89df4640d812.png?resizew=166)
(1)若1经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1a9821a00b71f6b7d7a76d91b3f810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fede072be17fcd61922337b19a8416a.png)
(2)若l经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bd398fd40404d070eaf8e08ec48a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d4677b06de8d4201bb48312af0b085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6316e624ef846b569d016dd186b5ed9d.png)
(3)若1经过这九个格点中的三个,直接写出所有满足这样的抛物线的条数.
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【推荐1】如图,二次函数
的图象交x轴于
,
两点,交y轴于点C.动点P从点A出发,以每秒1个单位长度的速度沿x轴向终点B运动.当点P运动到线段
上时,过点P作
轴,交线段
于Q,交抛物线于点D,设运动的时间t秒.
(2)连接
,当t为何值时
的值最大,此时
的面积为多少?
(3)作线段
的垂直平分线交直线
于点M,连接
,随着点P的运动,当点M在直线
的上方且
时,求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9553fb9beb9ed49ea5f7a0f077884d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab142c659d5434d88d7f6f5d994cfd18.png)
(3)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8940e32d5e7b00cecbdc77e5966b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d2085250e35271ce739fca9ca7241a.png)
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【推荐2】如图,已知抛物线
与x轴交于A,B两点,与y轴交于点C,点B的坐标为
.
(1)求m的值及抛物线的对称轴.
(2)点P是抛物线对称轴l上的一个动点,当
的值最小时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f293137dde083174fa9e6f56a1605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b569572c8d9bf05d78d3ab741e68bb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/333054c4-b478-4683-b8c9-17819faee4e7.png?resizew=168)
(1)求m的值及抛物线的对称轴.
(2)点P是抛物线对称轴l上的一个动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
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【推荐1】如图,二次函数
的图象与
轴交于
,
两点,与
轴交于点
,且关于直线
对称,点
的坐标为
.
(2)连接
,若点
在
轴上时,
和
的夹角为
,求线段
的长度;
(3)当
时,二次函数
的最小值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](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/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115fbe4b8d73487566918ccd63915f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知:在平面直角坐标系
中,二次函数
的图象经过点
,且与y轴相交于点C.
(1)求这个二次函数的解析式;
(2)设点D为
轴正半轴上一点,联结
,如果
,求点D的坐标;
(3)设点P在y轴上,且位于点C下方的一点,如果
,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bd230dc2b5cf6e8087a483c243dea9.png)
(1)求这个二次函数的解析式;
(2)设点D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdf1edd3f1f0c5f28618006ca9162cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf15f23e8531a3127fa09b9a8dacab6a.png)
(3)设点P在y轴上,且位于点C下方的一点,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7f9e91283a9c4c83232e7c8e2f6fac.png)
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