平面直角坐标系中,已知抛物线经过A(-3,0),B(0,-3),C(1,0)三点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/3021f1d8-4557-4327-b6ef-bb7c3779d82e.png?resizew=530)
(1)求抛物线的解析式;
(2)若点M为第三象限内抛物线上一动点,点M的横坐标为m,△AMB的面积为S.求S关于m的函数关系式,并求出S的最大值;
(3)若点P是抛物线上的动点,点Q是直线y=-x上的动点,判断有几个位置能够使得点P、Q、B、O为顶点的四边形为平行四边形,直接写出相应的点Q的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/3021f1d8-4557-4327-b6ef-bb7c3779d82e.png?resizew=530)
(1)求抛物线的解析式;
(2)若点M为第三象限内抛物线上一动点,点M的横坐标为m,△AMB的面积为S.求S关于m的函数关系式,并求出S的最大值;
(3)若点P是抛物线上的动点,点Q是直线y=-x上的动点,判断有几个位置能够使得点P、Q、B、O为顶点的四边形为平行四边形,直接写出相应的点Q的坐标.
更新时间:2018-04-22 16:40:53
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【推荐1】如图,抛物线y=ax2﹣2ax+c的图象经过点C(0,﹣2),与x轴交于A(﹣1,0)、B两点.
(1)求抛物线的解析式及点B的坐标;
(2)若P为线段BC下方抛物线上的一动点,设△PBC的面积为S,求S的最大值.
(1)求抛物线的解析式及点B的坐标;
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【推荐2】如图,已知抛物线
交
轴于点
(点
在点
左侧),交
轴于点
,且
;
(2)如图2,点
在第一象限的抛物线上,连接
交
轴于点
,若点
的横坐标为
,
的面积为
,求
与
间的函数关系式(不要求写出
的取值范围);
(3)如图3,在(2)的条件下,连接
,
,以
为斜边在
下方作等腰直角
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e71461c5134339b5b54a80e588640f.png)
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(2)如图2,点
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(3)如图3,在(2)的条件下,连接
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【推荐1】如图,在平面直角坐标系中,抛物线
与x轴交于点
与y轴交于点
.
(2)点P为直线AB上方抛物线上一动点,过点P作PQ⊥x轴于点Q,交AB于点M,求
的最大值及此时点P的坐标;
(3)在(2)的条件下,点
与点P关于抛物线
的对称轴l对称.点C在抛物线上,点D在对称轴l上,直接写出所有使得以点A、
、C、D为顶点的四边形是平行四边形的点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041f81a26abfcb8a540ee721dc13e3bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f5e607ed8f8812cd9d40b693074fe.png)
(2)点P为直线AB上方抛物线上一动点,过点P作PQ⊥x轴于点Q,交AB于点M,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c6e9aa731db0fdfe1ecd99cddc32a5.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
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【推荐2】如图,在平面直角坐标系中,已知抛物线y=ax2+bx+3与y轴交于点C,与x轴交于点A,B,连接BC.点A的坐标为(
,0),tan∠OBC=
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DE的最大值及此时点P的坐标;
(3)将抛物线y=ax2+bx+3沿射线CA方向平移3
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(3)将抛物线y=ax2+bx+3沿射线CA方向平移3
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