如图,在直角坐标系中,四边形OABC是平行四边形,经过A(﹣2,0),B,C三点的抛物线y=ax2+bx+
(a<0)与x轴的另一个交点为D,其顶点为M,对称轴与x轴交于点E.
(1)求这条抛物线对应的函数表达式;
(2)已知R是抛物线上的点,使得△ADR的面积是平行四边形OABC的面积的
,求点R的坐标;
(3)已知P是抛物线对称轴上的点,满足在直线MD上存在唯一的点Q,使得∠PQE=45°,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
(1)求这条抛物线对应的函数表达式;
(2)已知R是抛物线上的点,使得△ADR的面积是平行四边形OABC的面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(3)已知P是抛物线对称轴上的点,满足在直线MD上存在唯一的点Q,使得∠PQE=45°,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/76913dea-3949-4b09-b468-e792936d5790.png?resizew=401)
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更新时间:2020-08-01 10:18:51
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【推荐1】直线
与
轴交于点
,与
轴交于点
,菱形
如图放置在平面直角坐标系中,其中点
在
轴负半轴上,直线
经过点
,交
轴于点
.
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(1)请直接写出点
,点
的坐标,并求出
的值;
(2)点
是线段
上的一个动点(点
不与
、
重合),经过点
且平行于
轴的直线交
于
,交
于
当四边形
是平行四边形时,求点
的坐标;
(3)点
是
轴正半轴上的一个动点,
是平面内任意一点,
为何值时,以点
、
、
、
为顶点的四边形是菱形?
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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(1)请直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(2)点
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(3)点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,抛物线
与x轴交于A,
两点(点A在点B的左侧),与y轴交于点
.
(2)若D为抛物线的顶点,求
的面积;
(3)若P是平面直角坐标系内一点,是否存在以A、B、C、P为顶点的四边形是平行四边形?若存在,请写出点P的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865638eb4f3818d76cd28a045b70e17d.png)
(2)若D为抛物线的顶点,求
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(3)若P是平面直角坐标系内一点,是否存在以A、B、C、P为顶点的四边形是平行四边形?若存在,请写出点P的坐标,若不存在,请说明理由.
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【推荐1】问题提出
(1)如图1,在
中,点D在BC上,连接AD,
,则
与
的面积之比为______;
问题探究
(2)如图2,在矩形ABCD中,
,
,点P为矩形内一动点,在点P运动的过程中始终有
,求
面积的最大值;(结果保留根号)
问题解决
(3)如图3,某市欲规划一块形如平行四边形ABCD的休闲旅游观光区,点A为观光区的入口,并满足
,要求在边BC上确定一点E为观光区的南门,为了方便市民游览,修建一条观光通道AE(观光通道的宽度不计),且
,
米,为了容纳尽可能多的游客,要求平行四边形ABCD的面积最大,请问是否存在满足上述条件的面积最大的平行四边形ABCD?若存在,求出平行四边形ABCD的最大面积;若不存在,请说明理由.(结果保留根号)
(1)如图1,在
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问题探究
(2)如图2,在矩形ABCD中,
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问题解决
(3)如图3,某市欲规划一块形如平行四边形ABCD的休闲旅游观光区,点A为观光区的入口,并满足
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【推荐2】△ABC与点O在10×10的网格中的位置如图所示
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(1)画出△ABC绕点O逆时针旋转90°后的图形;
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【推荐1】已知抛物线
经过点
,
,与y轴的交点为C.
(1)求该抛物线的函数表达式;
(2)若点P是该抛物线上一点,且位于其对称轴m右侧,对称轴m与x轴交于点M,过点P作
轴,垂足为N.若
,求出点P的坐标.
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(1)求该抛物线的函数表达式;
(2)若点P是该抛物线上一点,且位于其对称轴m右侧,对称轴m与x轴交于点M,过点P作
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【推荐2】如图,在平面直角坐标系中,已知二次函数y=ax2+4ax+c(a<0)的图像与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,顶点为点D,DH⊥x轴于H与AC交于点E.连接CD、BC、BE.若S△CBE∶S△ABE=2∶3,
(1)点A的坐标为 ,点B的坐标为 ;
(2)连结BD,是否存在数值a,使得∠CDB=∠BAC?若存在,请求出a的值;若不存在,请说明理由;
(3)若AC恰好平分∠DCB,求二次函数的表达式.
(1)点A的坐标为 ,点B的坐标为 ;
(2)连结BD,是否存在数值a,使得∠CDB=∠BAC?若存在,请求出a的值;若不存在,请说明理由;
(3)若AC恰好平分∠DCB,求二次函数的表达式.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/9b4bb72a-297a-49bd-8840-6c9968754286.png?resizew=184)
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