如图,二次函数
的图象与y轴交于C点,交x轴于点A(-2,0),B(6,0),P是该函数在第一象限内图象上的动点,过点P作PQ⊥BC于点Q,连接PC,AC.
(1)求该二次函数的表达式;
(2)求线段PQ的最大值;
(3)是否存在点P,使得以点P,C,Q为顶点的三角形与△ACO相似?若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796f4d16fe73f441668f394d9f0aee25.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/69ec9396-d9eb-446b-9225-1ba7501752d6.png?resizew=156)
(1)求该二次函数的表达式;
(2)求线段PQ的最大值;
(3)是否存在点P,使得以点P,C,Q为顶点的三角形与△ACO相似?若存在,请求出点P的坐标;若不存在,请说明理由.
更新时间:2020-05-24 14:08:26
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解答题-证明题
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【推荐1】如图,在平面直角坐标系中,顶点为
的抛物线交
轴于
点,交
轴于
,
两点(点
在点
的左侧),已知
点坐标为
.
![](https://img.xkw.com/dksih/QBM/2020/12/12/2612442314686464/2614146080464896/STEM/bb9f6eb9ef984d2ba25e04ad3e28bb7b.png?resizew=192)
(1)求此抛物线的解析式;
(2)过点
作线段
的垂线交抛物线于点
,如果以点
为圆心的圆与直线
相切,请判断抛物线的对称轴
与
有怎样的位置关系,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3615b5b7242dcf59988e8ce3b4473d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9ee0ee7f51cfe25a00eda7b361372c.png)
![](https://img.xkw.com/dksih/QBM/2020/12/12/2612442314686464/2614146080464896/STEM/bb9f6eb9ef984d2ba25e04ad3e28bb7b.png?resizew=192)
(1)求此抛物线的解析式;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
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【推荐2】如图,抛物线
,平移抛物线
,使其顶点D在抛物线
位于y轴右侧的图象上,得到抛物线
,抛物线
交x轴于A、B两点(点A在点B的左侧),交y轴于点C,设点D的横坐标为a.
(1)当
时,求抛物线
的解析式.
(2)在抛物线的
的对称轴上是否存在一点P,使得
的长最短?若存在、求出点P的坐标(用含a的代数式表示);若不存在;请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2d8b527a07c8aa7ec9068d9f723c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57e815c01a412466a6aa12d3e883a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/adc20579-0542-460e-b144-0b1f98479163.jpg?resizew=183)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)在抛物线的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e538ecb0f77fb4ac984f70241f5c3bf3.png)
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【推荐1】如图,已知矩形
,点
,
分别在
,
轴上,抛物线
经过
,
两点,且与
轴交于点
.动点
从点
出发,以每秒1个单位的速度沿射线
方向运动,设
运动的时间为
(秒
,射线
交抛物线于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/78a8be24-49bb-4b58-8bc9-93a833c4f214.png?resizew=200)
(1)求抛物线的解析式;
(2)连接
,是否存在这样的时刻
,使得
?若存在请求出
的值;若不存在,请说明理由.
(3)连接
和
,若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/78a8be24-49bb-4b58-8bc9-93a833c4f214.png?resizew=200)
(1)求抛物线的解析式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a446d09d0a0c044c11a2ecdc151f756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-证明题
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【推荐2】已知
,点
是射线
上一点,过点
作
,点
是平面内一动点(不与点
重合),连接
,将线段
绕点
顺时针旋转
,得到线段
(点
不与点
重合).连接
.取
的中点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/eb4529c2-de0a-4574-bd9e-110dc3a3b72a.png?resizew=431)
(1)如图1,当点
落在线段
上时:
①求证:
;
②直接写出直线
与直线
相交所成的较小角的度数为______.
(2)如图2,当点
落在平面内其他位置时,
是否仍然成立?若成立,请就图2的情形给出证明;若不成立,请说明理由.
(3)若
,当点
在同一条直线上时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e252f4bc1975af1c7a775b46fab64ee5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/eb4529c2-de0a-4574-bd9e-110dc3a3b72a.png?resizew=431)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6015d15c7b1e1d38accc9af3741def42.png)
②直接写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6015d15c7b1e1d38accc9af3741def42.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5cb4c1a1e040c9432963a9a0f5f553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fb188915d2e3d7bfd633fa18221b07.png)
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【推荐3】如图1,四边形OABC是矩形,点A的坐标为(3,0),点C的坐标为(0,6),点P从点O出发,沿OA以每秒1个单位长度的速度向点A出发,同时点Q从点A出发,沿AB以每秒2个单位长度的速度向点B运动,当点P与点A重合时运动停止.设运动时间为t秒.
(1)当t=2时,线段PQ的中点坐标为_____;
(2)当△CBQ与△PAQ相似时,求t的值;
(3)当t=1时,抛物线y=x2+bx+c经过P,Q两点,与y轴交于点M,抛物线的顶点为K,如图2所示,问该抛物线上是否存在点D,使∠MQD=
∠MKQ?若存在,求出所有满足条件的D的坐标;若不存在,说明理由.
(1)当t=2时,线段PQ的中点坐标为_____;
(2)当△CBQ与△PAQ相似时,求t的值;
(3)当t=1时,抛物线y=x2+bx+c经过P,Q两点,与y轴交于点M,抛物线的顶点为K,如图2所示,问该抛物线上是否存在点D,使∠MQD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2019/1/2/2110149740077056/2111327382298624/STEM/1ef78b8d3d174a83b6cba28c9f58bc9a.png?resizew=285)
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【推荐1】如图,抛物线
与x轴交于
,
两点,与y轴交于点C.
(2)设点 P 是抛物线上的一个动点,是否存在满足
的点 P? 若存在,请求出点 P 的坐标;若不存在,请说明理由.
(3)点 Q 是抛物线上的一个动点,当
时,请直接写出点 Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c0c5cad5bc172406ed888808852f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f236f60563cc27e1f4ccb31bb54a7d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff602c3a73d8a7713cfd95e08fd4b1ce.png)
(2)设点 P 是抛物线上的一个动点,是否存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8db02b25beecbccd333e74161634c31.png)
(3)点 Q 是抛物线上的一个动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1026dd0ff8fc19e7699b552a83eeed50.png)
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解题方法
【推荐2】如图,在平面直角坐标系xOy中,已知二次函数:y=
x2﹣2x﹣6的图象与x轴交于A、B两点(点A在点B的左边),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424471433216/2926871301791744/STEM/965251dc2ab545cfaeec37d3372ddc5c.png?resizew=211)
(1)求点A、点C的坐标及对称轴方程;
(2)若直线y=﹣
x+m将△AOC的面积分成相等的两部分,求m的值;
(3)点B是该二次函数图象与x轴的另一个交点,点D是直线x=2上位于x轴下方的动点,点E是第四象限内该二次函数图象上的动点,且位于直线x=2右侧.若以点E为直角顶点的△BED与△AOC相似,求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424471433216/2926871301791744/STEM/965251dc2ab545cfaeec37d3372ddc5c.png?resizew=211)
(1)求点A、点C的坐标及对称轴方程;
(2)若直线y=﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)点B是该二次函数图象与x轴的另一个交点,点D是直线x=2上位于x轴下方的动点,点E是第四象限内该二次函数图象上的动点,且位于直线x=2右侧.若以点E为直角顶点的△BED与△AOC相似,求点E的坐标.
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