已知:函数y=ax2+x+1的图象与x轴只有一个公共点.
(1)求这个函数关系式;
(2)如图所示,设二次函数y=ax2+x+1图象的顶点为B,与y轴的交点为A,P为图象上的一点,若以线段PB为直径的圆与直线AB相切于点B,求P点的坐标;
(3)在(2)中,若圆与x轴另一交点关于直线PB的对称点为M,试探索点M是否在抛物线y=ax2+x+1上?若在抛物线上,求出M点的坐标;若不在,请说明理由.
(1)求这个函数关系式;
(2)如图所示,设二次函数y=ax2+x+1图象的顶点为B,与y轴的交点为A,P为图象上的一点,若以线段PB为直径的圆与直线AB相切于点B,求P点的坐标;
(3)在(2)中,若圆与x轴另一交点关于直线PB的对称点为M,试探索点M是否在抛物线y=ax2+x+1上?若在抛物线上,求出M点的坐标;若不在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/27/1933143212998656/1935897707618304/STEM/3c7f6d68df074cc2aa32158868ffad28.png?resizew=230)
更新时间:2018-05-01 12:56:52
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【知识点】 其他问题(二次函数综合)
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解答题-问答题
|
较难
(0.4)
【推荐1】如图
,在平面直角坐标系中,抛物线与
轴交于
、
两点,与
轴交于点
,顶点
的坐标为
.
(2)已知直线
:
与抛物线交于
、
两点
点
在
的左侧
,点
为线段
上的一个动点,过
作
轴的平行线交抛物线于点
,求
的最大值及此时点
的坐标;
(3)在(2)的条件下,如图
,若点
是
的中点,将
绕点
旋转,旋转过程中,点
的对应点为
、点
的对应点为
,将抛物线沿直线
的方向平移
两侧均可
,在平移过程中点
的对应点为
,在运动过程中是否存在点
和点
关于
的某一边所在直线对称
与
不重合
,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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d1e4a02f6a99a4b838dcaf9541d7f9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6178c66fe562395461d1708412e71b7.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86bebdf5931efbdc627baa52f97392e.png)
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(3)在(2)的条件下,如图
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解答题-问答题
|
较难
(0.4)
名校
【推荐2】我们约定,在平面直角坐标系中,对于不同的两点
,如果满足
,那么称
两点互为“等差点”.
(1)请判断在点
中,有哪些点与点
互为“等差点”?
(2)已知点
在直线
上,点
在双曲线
(
为常数,且
)上,且
两点互为“等差点”.请求出点
的坐标(用含
的代数式表示);
(3)已知抛物线
(
为常数且
)的顶点为
点,与
轴交于
两点,
两点分别在抛物线
和直线
上,如果
两点互为“等差点”,且
两点的横坐标是一元二次方程
的两根,求
的值.
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(1)请判断在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b0a87521c3a51f13a095396ea7ba85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc3ce1d01d31ca481c3e52863012d5d.png)
(2)已知点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b283b0b9319409f997ab20fc2cadc241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3c01daa35f89800e6f7a10ee1c1f7e.png)
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