在如图的平面直角坐标系中,抛物线y=ax2﹣2amx+am2+1(a<0)与x轴交于点A和点B,点A在点B的左侧,与y轴交于点C,顶点是D,且∠DAB=45°.
(1)填空:点C的纵坐标是 (用含a、m的式子表示);
(2)求a的值;
(3)点C绕O逆时针旋转90°得到点C′,当﹣
≤m≤
时,求BC′的长度范围.
(1)填空:点C的纵坐标是 (用含a、m的式子表示);
(2)求a的值;
(3)点C绕O逆时针旋转90°得到点C′,当﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://img.xkw.com/dksih/QBM/2019/1/28/2128344279613440/2130027356135424/STEM/19a138a18ab443a79303927ddb19c28d.png?resizew=230)
更新时间:2019-01-30 19:34:39
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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
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【推荐1】如图,在平面直角坐标系中,点
为坐标原点,抛物线
与
轴交于点
,与
轴交于点
,连接
,直线
经过
、
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/fff95b5c-ebcb-44f5-b042-d93f22d04bf8.png?resizew=485)
(1)求抛物线的解析式;
(2)点
为线段
上一点,连接
,过点
作
的垂线与过点
作
轴的垂线交于点
,设点
的横坐标为
,线段
的长度为
,求
与
之间的函数关系式(不要求写出自变量
的取值范围);
(3)在(2)的条件下,点
为
上一点,连接
,
,将线段
绕点
顺时针旋转
得到线段
,若抛物线经过点
,
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3666050060fb25232784bb8ed3545ed.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/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/812eed46a589bde8b7c78a81a8cf9b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/fff95b5c-ebcb-44f5-b042-d93f22d04bf8.png?resizew=485)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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名校
【推荐2】某数学兴趣小组在探究函数
的图象和性质时经历以下几个学习过程:
(Ⅰ)列表(完成以下表格).
(Ⅱ)描点并画出函数图象草图(在备用图①中描点并画图).
(Ⅲ)根据图象解决以下问题:
(1)数学小组探究发现直线
与函数
的图象交于点
,
,则不等式
的解集是______.
(2)设函数
的图象与x轴交于A,B两点(B位于A的右侧),与y轴交于点C.
①求直线BC的解析式;
②探究应用:将直线BC沿y轴平移m个单位长度后与函数
的图象恰好有3个交点,求此时m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68591cf3ce4c7634dcc801711fad0d.png)
(Ⅰ)列表(完成以下表格).
x | … | 0 | 1 | 2 | 3 | 4 | 5 | … | |||
… | 12 | 5 | 0 | — | 0 | 5 | 12 | … | |||
… | 12 | 5 | 0 | — | — | — | 0 | 5 | 12 | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/4e81a40e-e4ed-40f7-beaa-f47be0eade46.png?resizew=443)
(Ⅲ)根据图象解决以下问题:
(1)数学小组探究发现直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68591cf3ce4c7634dcc801711fad0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c86f9e71f147c6dc1fefddfb0304afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d986a5207567f4516f7c359c4d60be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ee4c1fe3ca3b45894766043f32b99a.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68591cf3ce4c7634dcc801711fad0d.png)
①求直线BC的解析式;
②探究应用:将直线BC沿y轴平移m个单位长度后与函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68591cf3ce4c7634dcc801711fad0d.png)
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【推荐3】如图,抛物线y=ax2+bx+c与x轴交于点A(-1,O)、C(3,0),点B为抛物线顶点,直线BD为抛物线的对称轴,点D在x轴上,连接AB、BC.
![](https://img.xkw.com/dksih/QBM/2019/7/4/2239690554425344/2240206259527680/STEM/1c9f0e32efdd4a2180101d8dae5f5aba.png?resizew=479)
⑴如图1,若∠ABC=60°,则点B的坐标为______________;
⑵如图2,若∠ABC=90°,AB与y轴交于点E,连接CE.
①求这条抛物线的解析式;
②点P为第一象限抛物线上一个动点,设△PEC的面积为S,点P的横坐标为m,求S关于m的函数关系武,并求出S的最大值;
③如图3,连接OB,抛物线上是否存在点Q,使直线QC与直线BC所夹锐角等于∠OBD,若存在请直接写出点Q的坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2019/7/4/2239690554425344/2240206259527680/STEM/1c9f0e32efdd4a2180101d8dae5f5aba.png?resizew=479)
⑴如图1,若∠ABC=60°,则点B的坐标为______________;
⑵如图2,若∠ABC=90°,AB与y轴交于点E,连接CE.
①求这条抛物线的解析式;
②点P为第一象限抛物线上一个动点,设△PEC的面积为S,点P的横坐标为m,求S关于m的函数关系武,并求出S的最大值;
③如图3,连接OB,抛物线上是否存在点Q,使直线QC与直线BC所夹锐角等于∠OBD,若存在请直接写出点Q的坐标;若不存在,说明理由.
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