如图,在平面直觓坐标系
中,拋物线
的顶点为
,交
轴于点
,点
是拋物线上一点.
的坐标.
(2)当
时,求二次函数
的最大值与最小值的差.
(3)若点
是
轴上方抛物线上的点(不与点
重合),设点
的横坐标为
,过点
作
轴,交直线
于点
,当线段
的长随
的增大而增大时,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39698959ba7b4d735e0121144427cfb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e60f98107a82434d300b04c0cc72b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f22c4898e2a23e0e888b69d79719f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65183d238c9bc2be73770717d890683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f27083267432a9352fb6677a07d461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
更新时间:2023-06-23 22:05:54
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相似题推荐
解答题-计算题
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【推荐1】在平面直角坐标系中,抛物线
与
轴交于
两点(点
在点
右侧),抛物线与
轴交于点
,对称轴为直线
.设
是抛物线与
轴交点的横坐标.
(1)求
的值;
(2)若点
是对称轴上的一动点,当
最小时,求点
的坐标;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88e5a55859b95a5e253f033c0209091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1441093334b71f88954eed46804c316c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacc21e339140056fbb5989317ee54be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】在平面直角坐标系
中,顶点为M的抛物线与x轴交于A、B两点,与y轴交于点C,已知
,
,
.连接
,作
交
的延长线于点D.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973768660254720/2975226572439552/STEM/00df1c1c-73c0-4774-a5d3-d5f77b45168d.jpg?resizew=334)
(1)求抛物线对应的二次函数表达式;
(2)求点D的坐标;
(3)直线
上是否存在点P,使得
的面积与四边形
面积之比为1∶2?如果存在请求出点P的坐标,如果不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/112c938fab7625be9a7ad5021fa55d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62855ff21228ecea8e28fd0fbeb814ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a480514bd97c791d4872642c87f622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973768660254720/2975226572439552/STEM/00df1c1c-73c0-4774-a5d3-d5f77b45168d.jpg?resizew=334)
(1)求抛物线对应的二次函数表达式;
(2)求点D的坐标;
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e534b545e86c02abd2a0dc75d32b407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9d0547e645c97e88f14e4267b7bb25.png)
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【推荐1】如图1:矩形OABC的顶点A、B在抛物线
上,OC在
轴上,且
.
(1)求抛物线的解析式及抛物线的对称轴.
(2)如图2,边长为
的正方形ABCD的边CD在
轴上,A、B两点在抛物线上,请用含
的代数式表示点B的坐标,并求出正方形边长
的值.
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/824b06980bc04b4d9cea45d1810ea298.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/426d06aa99304290aae24d75635bcb8b.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/0f4dee9ec2e24c89abbc23d70c102d1a.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/10c26ec1b36e45b2a2717ac442844398.png)
(1)求抛物线的解析式及抛物线的对称轴.
(2)如图2,边长为
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/588105fcc7d444a6b0e89609c4fde5ec.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/0f4dee9ec2e24c89abbc23d70c102d1a.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/588105fcc7d444a6b0e89609c4fde5ec.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/588105fcc7d444a6b0e89609c4fde5ec.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/824b06980bc04b4d9cea45d1810ea298.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1573968648585216/1573968655163392/STEM/f156ace1909c440d93c6b9983ee0d864.png)
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【推荐2】在平面直角坐标系xOy中,抛物线的解析式为y=x2﹣6ax+6a.
(1)求抛物线的对称轴(用含a的式子表示);
(2)当x≥a时,二次函数的图像记为图形G.
①当图形G与坐标轴有两个不同的交点时,求a的取值范围;
②当图形G上恰有3个点到x轴的距离为1时,请直接写出a的取值范围.
(1)求抛物线的对称轴(用含a的式子表示);
(2)当x≥a时,二次函数的图像记为图形G.
①当图形G与坐标轴有两个不同的交点时,求a的取值范围;
②当图形G上恰有3个点到x轴的距离为1时,请直接写出a的取值范围.
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【推荐1】在平面直角坐标系xOy中,抛物线G:y=x2﹣(m+n)x+mn(﹣4<m<0,n>0)与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,点P是抛物线G位于第三象限上的点,连接AC,PC.
(1)求A,B,C三点的坐标(用含m,n的代数式表示);
(2)若存在点P,使得∠PCA=2∠CAO,求
的取值范围;
(3)连接OP,设AC交OP于点D,△PCD的面积为S1,△OCD的面积为S2,若
的最大值是
,求OB的最大值.
(1)求A,B,C三点的坐标(用含m,n的代数式表示);
(2)若存在点P,使得∠PCA=2∠CAO,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7e6acbd699e28d5ff43b7e17ac6efc.png)
(3)连接OP,设AC交OP于点D,△PCD的面积为S1,△OCD的面积为S2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24676ed477d7b6a0782bead3f9b7ccf9.png)
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真题
名校
【推荐2】如图,已知抛物线
(a≠0)与x轴交于点A(1,0)和点B(-3,0),与y轴交于点C,且OC=OB.
(2)若点E为第二象限抛物线上一动点,连接BE,CE,求四边形BOCE面积的最大值,并求出此时点E的坐标;
(3)点P在抛物线的对称轴上,若线段PA绕点P逆时针旋转90°后,点A的对应点A′恰好也落在此抛物线上,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)若点E为第二象限抛物线上一动点,连接BE,CE,求四边形BOCE面积的最大值,并求出此时点E的坐标;
(3)点P在抛物线的对称轴上,若线段PA绕点P逆时针旋转90°后,点A的对应点A′恰好也落在此抛物线上,求点P的坐标.
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【推荐1】如图1,
是边长为2的等边三角形,以
为一边向下作矩形
,其中
.M为线段
上的动点(且不与
重合),过M作矩形
,使边
在线段
上.
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645649259683840/2646062592655360/STEM/5fc1e54b-e368-4fd1-a71b-65cbd386c795.png)
(1)当
为
时,请直接写出矩形
的面积;
(2)设
,矩形
的面积为y,
①试求出y关于x的函数表达式;
②矩形
的面积y是否有最大值,若有,请求出这个最大值;若没有,请说明理由.
(3)如图2,过点N作
的平行线,交线段
于点F,连结
,若
为直角三角形,请直接写出线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1333acc72211e3ddb9a0f8c726ce8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1772fcf5995e63876fe258e38cfbdb03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645649259683840/2646062592655360/STEM/5fc1e54b-e368-4fd1-a71b-65cbd386c795.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16edecab3862a10bc9480543c34478a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0409dcc992e45d68b10278f941b0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
①试求出y关于x的函数表达式;
②矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
(3)如图2,过点N作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33181b27b10690b4913595f8c1f46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图1,已知二次函数
的顶点坐标为(1,
),其图象与x轴交于A、B两点,其中点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/2cc630ca-5618-4d10-bfbb-6a43fefa87b5.png?resizew=329)
(1)求二次函数的解析式;
(2)若点P为线段
上方抛物线上的一点,当点P到线段
的距离最大时,求点P的坐标;
(3)如图2,已知点M为对称轴上一点,点N为抛物线上一点,若以点B、C、M、N为顶点的四边形为平行四边形,求点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f2638d71e5d00c241c6704b32094d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d53dc90eda37470f48cd23694bd3075.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/2cc630ca-5618-4d10-bfbb-6a43fefa87b5.png?resizew=329)
(1)求二次函数的解析式;
(2)若点P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(3)如图2,已知点M为对称轴上一点,点N为抛物线上一点,若以点B、C、M、N为顶点的四边形为平行四边形,求点N的坐标.
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