已知抛物线y=﹣
x2+bx+c的对称轴为直线x=1,最小值为3,此抛物线与y轴交于点A,顶点为B,对称轴BC与x轴交于点C.
(1)求抛物线的解析式.
(2)如图1.求点A的坐标及线段OC的长;
(3)点P在抛物线上,直线PQ∥BC交x轴于点Q,连接BQ.
①若含45°角的直角三角板如图2所示放置.其中,一个顶点与点C重合,直角顶点D在BQ上,另一个顶点E在PQ上.求直线BQ的函数解析式;
②若含30°角的直角三角板一个顶点与点C重合,直角顶点D在直线BQ上,另一个顶点E在PQ上,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(1)求抛物线的解析式.
(2)如图1.求点A的坐标及线段OC的长;
(3)点P在抛物线上,直线PQ∥BC交x轴于点Q,连接BQ.
①若含45°角的直角三角板如图2所示放置.其中,一个顶点与点C重合,直角顶点D在BQ上,另一个顶点E在PQ上.求直线BQ的函数解析式;
②若含30°角的直角三角板一个顶点与点C重合,直角顶点D在直线BQ上,另一个顶点E在PQ上,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2012/2/26/1573347359268864/1573347405111296/STEM/7334c682774449a8bf07af51359c548d.png?resizew=487)
12-13九年级上·北京房山·期末 查看更多[1]
(已下线)2011-2012年北京房山区九年级第一学期期末考试数学卷
更新时间:2016-12-05 07:26:24
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相似题推荐
解答题-问答题
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【推荐1】已知,抛物线
与x轴交于点
,
与y轴交于点C.
(2)如图1,抛物线顶点为D,点P在抛物线上,若
,求点P的坐标;
(3)如图2,直线
过点
,交抛物线于
两点(点E在点F左侧,且点E不与点A重合),直线
分别交y轴于点
.请判断:
是否为定值,如果是定值,求其定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fd86c007cac35b23af3d5531264bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
(2)如图1,抛物线顶点为D,点P在抛物线上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39344fb780480cd3a595e28d992234a1.png)
(3)如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71e2b1568283f0d4c7c5aa057d84759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26260c10afb34f543d86b67898134f3.png)
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【推荐2】已知抛物线
与x轴交点A(1,0),B(-3,0)与y轴交点B(0,3),如图1所示,D为抛物线的顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/84badc8b-d048-4ab2-b6d8-83d3993cd11b.png?resizew=407)
(1)求抛物线的解析式;
(2)如图1若R为y轴上的一个动点,连接
,则
的最小值为
(3)在x轴上取一动点P(m,0),
,过点P作x轴的垂线,分别交抛物线、CD、CB于点Q、F、E,如图2所示,求证EF=EP.
(4)设此抛物线的对称轴为直线MN,在直线MN上取一点T,使
直接写出点T的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/84badc8b-d048-4ab2-b6d8-83d3993cd11b.png?resizew=407)
(1)求抛物线的解析式;
(2)如图1若R为y轴上的一个动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6da2235c42867f9a79007c3fc83fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9c4df6ecd4bcf85b33c5906ba59ede.png)
(3)在x轴上取一动点P(m,0),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e524f366b30bd2523bd480c8acbfe362.png)
(4)设此抛物线的对称轴为直线MN,在直线MN上取一点T,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48fbcf746fe171ad9cc292e6b0eaf00.png)
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解题方法
【推荐1】如图1,若二次函数
的图像与
轴交于点
(-1,0)、
,与
轴交于点
(0,4),连接
、
,且抛物线的对称轴为直线
.
![](https://img.xkw.com/dksih/QBM/2020/4/7/2442986388512768/2445009105960960/STEM/b5b6ce74-1b02-4b1b-af82-f00e60b4de32.png)
(1)求二次函数的解析式;
(2)若点
是抛物线在一象限内
上方一动点,且点
在对称轴的右侧,连接
、
,是否存在点
,使
?若存在,求出点
的坐标;若不存在,说明理由;
(3)如图2,若点
是抛物线上一动点,且满足
,请直接写出点
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/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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d599059e6b2c918ab15ee22611b6962.png)
![](https://img.xkw.com/dksih/QBM/2020/4/7/2442986388512768/2445009105960960/STEM/b5b6ce74-1b02-4b1b-af82-f00e60b4de32.png)
(1)求二次函数的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/d2be49c37e30a3ced0364c3e74d8c687.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ec561df02465d3c574c0505386154c.png)
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(0.4)
【推荐2】如图,已知菱形中,对角线
、
相交于点
,且
,
,点
从点
出发,沿
方向匀速向点
运动,速度为
;同时,点
从点
出发,沿
方向匀速向点
运动,速度为
,
,交
于点
.当点
、
中有一点停止运动时,另一点也停止运动,线段
也停止运动,连接
、
.解答下列问题:
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68741489eb6ea96a8a24c6aa46f32c00.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e720f02f9746caa27fc9c9e7dadd17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c03eda3511f941a4a7832f847cb0d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e32b149c6b4a744476aba9a24d179b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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