在平面直角坐标系xOy中(如图),已知抛物线y=ax2+4ax+c(a≠0)经过A(0,4),B(﹣3,1),顶点为C.
(1)求该抛物线的表达方式及点C的坐标;
(2)将(1)中求得的抛物线沿y轴向上平移m(m>0)个单位,所得新抛物线与y轴的交点记为点D.当△ACD时等腰三角形时,求点D的坐标;
(3)若点P在(1)中求得的抛物线的对称轴上,连接PO,将线段PO绕点P逆时针转90°得到线段PO′,若点O′恰好落在(1)中求得的抛物线上,求点P的坐标.
(1)求该抛物线的表达方式及点C的坐标;
(2)将(1)中求得的抛物线沿y轴向上平移m(m>0)个单位,所得新抛物线与y轴的交点记为点D.当△ACD时等腰三角形时,求点D的坐标;
(3)若点P在(1)中求得的抛物线的对称轴上,连接PO,将线段PO绕点P逆时针转90°得到线段PO′,若点O′恰好落在(1)中求得的抛物线上,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/0da4bcb8-7643-428e-aaaf-8d11ee3201f6.png?resizew=195)
更新时间:2020-04-01 18:24:01
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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,二次函数
的图象经过点
,点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/1262513b-b83b-4ad4-ad28-a6fcca0178bb.png?resizew=210)
(1)求此二次函数的解析式;
(2)当
时,求二次函数
的最大值和最小值;
(3)点P为此函数图象上任意一点,其横坐标为m,过点P作
轴,点Q的横坐标为
.已知点P与点Q不重合,且线段
的长度随m的增大而增大.
①求m的取值范围;
②当
时,直接写出线段
与二次函数
的图象交点个数及对应的m的取值范围.
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/1262513b-b83b-4ad4-ad28-a6fcca0178bb.png?resizew=210)
(1)求此二次函数的解析式;
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
(3)点P为此函数图象上任意一点,其横坐标为m,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7316ef3dcf6008a68e0b3a018ee7e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346b39f3d56c769c5bdbd019bda9ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
①求m的取值范围;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e47ed54eebf64d940e32416db9c9cb.png)
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解答题-证明题
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较难
(0.4)
【推荐2】如图①,抛物线
的图象与
轴交于
两点,与
轴交于点
,连接
,二次函数的对称轴与
轴的交于点
,作射线
.
抛物线
的解析式为 ; 点
坐标为_ ;
求证:射线
是
的角平分线;
如图②,点
是
的正半轴上一点,过点
作
轴的平行线,与直线
交于点
,与抛物线交于点
,连结
,将
沿
翻折,
的对应点为
.在图②中探究;是否存在点
,使褥
恰好落在
轴的正半轴上?若存在,请求出
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