如图1,已知抛物线
与x轴交于A、B两点,与y轴交于C点,且点A的坐标为
、点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976292591304704/2981487964348416/STEM/ec26fb8d-f840-4563-9c1b-087a5ee8c0ff.png?resizew=526)
(1)请写出该抛物线的函数表达式和点B的坐标;
(2)如图2,有两动点D、E在
的边上运动,运动速度均为每秒5个单位长度,它们分别从点C和点B同时出发,点D沿折线COB按C→O→B方向向终点B运动,点E沿线段BC按B→C方向向终点C运动,当其中一个点到达终点时,另一个点也随之停止运动.设运动时间为t秒,请解答下列问题:
①当t为何值时,
的面积等于
;
②在点D、E运动过程中,该抛物线上存在点F,使得依次连接AD、DF、FE、EA得到的四边形ADFE是平行四边形,请直接写出所有符合条件的点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df04abfcf792463c45866b9f32472c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976292591304704/2981487964348416/STEM/ec26fb8d-f840-4563-9c1b-087a5ee8c0ff.png?resizew=526)
(1)请写出该抛物线的函数表达式和点B的坐标;
(2)如图2,有两动点D、E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d630091e362f48d6dbc73811e07d41.png)
①当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a85a2c984df17f7ef91d014d931410d.png)
②在点D、E运动过程中,该抛物线上存在点F,使得依次连接AD、DF、FE、EA得到的四边形ADFE是平行四边形,请直接写出所有符合条件的点F的坐标.
更新时间:2022-05-17 19:15:42
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【推荐1】如图(1),抛物线y=ax2+bx经过A和B(3,﹣3)两点,点A在x轴的正半轴,且OA=4.
(1)求抛物线的解析式;
(2)若点M是抛物线上一动点,且在直线OB的下方(不与O、B重合),过M作MK⊥x轴,交直线BO于点N,过M作MP∥x轴,交直线BO于点P,求出△MNP周长的最大值及周长取得最大值时点M的坐标;
(3)如图(2),过B作BD⊥y轴于点D,交抛物线于点C,连接OC,在抛物线上是否存在点Q使得S△OCD:S△OCQ=3:2,若存在,请求出点Q的坐标,若不存在,请说明理由.
(1)求抛物线的解析式;
(2)若点M是抛物线上一动点,且在直线OB的下方(不与O、B重合),过M作MK⊥x轴,交直线BO于点N,过M作MP∥x轴,交直线BO于点P,求出△MNP周长的最大值及周长取得最大值时点M的坐标;
(3)如图(2),过B作BD⊥y轴于点D,交抛物线于点C,连接OC,在抛物线上是否存在点Q使得S△OCD:S△OCQ=3:2,若存在,请求出点Q的坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/ef3bbec0-d2fd-491e-8c1b-25b057bb1304.jpg?resizew=314)
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解题方法
【推荐2】综合与探究
如图,抛物线
与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,且A,B两点的坐标分别是
.点P是抛物线上的一个动点,点P的横坐标为m,过点P作直线
轴,交直线
于点G,交直线
于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/f4aac881-d930-44e5-b663-4cf43dce2050.png?resizew=450)
(1)求抛物线的函数表达式及点C的坐标.
(2)如果点D是抛物线的顶点,点P在点C和点D之间运动时,试判断在抛物线的对称轴上是否存在一点N,使得
是等腰直角三角形,若存在,请求出点N的坐标;若不存在,请说明理由.
(3)试探究在抛物线的对称轴上是否存在点Q,使得以点P,Q,B,C为顶点的四边形是平行四边形,若存在,请直接 写出点P的坐标;若不存在,请说明理由.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392fa642cd917509372a926ae1833cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d1f0a38571c5acbcad40b8f63ff3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165a501b2e6a3acc46212e59a166c053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/f4aac881-d930-44e5-b663-4cf43dce2050.png?resizew=450)
(1)求抛物线的函数表达式及点C的坐标.
(2)如果点D是抛物线的顶点,点P在点C和点D之间运动时,试判断在抛物线的对称轴上是否存在一点N,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d39a1ebabcdb182e380a69a4ef103d.png)
(3)试探究在抛物线的对称轴上是否存在点Q,使得以点P,Q,B,C为顶点的四边形是平行四边形,若存在,请
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【推荐1】已知
中,
,以
和
为边向外作等边
和等边
.
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642493926014976/2645612629073920/STEM/6bed1c35-d2a2-42bf-99c2-3150e28ed129.png?resizew=550)
(1)连接
、
,如图
,求证:
;
(2)若
为
中点,连接
,如图
,求证:
;
(3)若
,延长
交
于
,
,如图
,则
.(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642493926014976/2645612629073920/STEM/6bed1c35-d2a2-42bf-99c2-3150e28ed129.png?resizew=550)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d023531372fdb3017974f81b2973833b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae0a531bb7d2bd94e65fa0fbeb96ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277d4fa62666459e91b0f16f3756c65.png)
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【推荐2】如图,在⊿ABC中,∠CBA=90º,∠CAB=50º,以AB为直径作⊙O交AC于点D,点E在边BC上,连结DE,且∠DEB=80º
(1)求证:直线ED是⊙O的切线;
(2)求证:DE=BE
(1)求证:直线ED是⊙O的切线;
(2)求证:DE=BE
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/334d046a-afb9-484d-af98-6ae7c825a236.png?resizew=130)
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【推荐1】如图,在平面直角坐标系中,抛物线y=x2+bx+c与x轴交于A,B两点,与y轴交于点C,已知B(3,0),C(0,-3),连接BC,点P是抛物线上的一个动点,点N是对称轴上的一个动点.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882302507696128/2946819154763776/STEM/9bb455b7-5db2-4e78-86df-172a9f5c2807.png?resizew=182)
(1)求该抛物线的解析式;
(2)若
PAB的面积为8,求点P的坐标;
(3)若点P在直线BC的下方,当点P到直线BC的距离最大时,在抛物线上是否存在点Q,使得以点P,C,N,Q为顶点的四边形是平行四边形?若存在,直接写出点Q的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882302507696128/2946819154763776/STEM/9bb455b7-5db2-4e78-86df-172a9f5c2807.png?resizew=182)
(1)求该抛物线的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)若点P在直线BC的下方,当点P到直线BC的距离最大时,在抛物线上是否存在点Q,使得以点P,C,N,Q为顶点的四边形是平行四边形?若存在,直接写出点Q的坐标;若不存在,请说明理由.
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【推荐2】如图,抛物线
与x轴交于
,
两点,直线
与y轴交于点C,与x轴交于点
点P是直线CD上方的抛物线上一动点,过点P作
轴于点F,交直线CD于点E,设点P的横坐标为m.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/72ce9d64-d760-4223-8af6-ad71665f2fca.png?resizew=190)
(1)求抛物线的解析式;
(2)连接PD,若
求P点坐标;
(3)求PE的长最大时m的值;
(4)
是平面直角坐标系内一点,在(3)的情况下,以P、Q、C、D为顶点的四边形是平行四边形是否存在?若存在,直接写出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef29d44f43562c120ff9f6daf3c00383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23508218f3045d5fa501fc2edeb526de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4951c613ab3519ed8988602d04f33cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921f59796f516e630dcfda68d706def1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1307ac4d43cd0e5cde7a6fa64dcc48ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550be78432dca3f7249666a295bb13b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/72ce9d64-d760-4223-8af6-ad71665f2fca.png?resizew=190)
(1)求抛物线的解析式;
(2)连接PD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730398ed48a0372ce13b5e49fca6bed7.png)
(3)求PE的长最大时m的值;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】如图,在平面直角坐标系中,直线
分别交
轴,
轴于
,
两点.抛物线
经过
,
两点,且与
轴的另一个交点为
.
(1)求该抛物线的解析式.
(2)若点
是线段
上一个动点,过点
作
轴的垂线,交该抛物线于点
,连接
,
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608def11fa0e2b34f05592ef1d11fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0b4afd16b79370532de44989d6c43d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/05aacb1a-d806-416a-82a0-f63b3e5768de.png?resizew=143)
(1)求该抛物线的解析式.
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
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【推荐2】如图所示,在平面直角坐标系
中,已知二次函数
的图象与x轴交于点
,与y轴交于点B.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/866ddfba-41bf-45e1-b3dc-ee7a52d6df6d.png?resizew=196)
(1)求该函数的表达式及顶点坐标;
(2)当
时,该二次函数有最大值2,请根据图象求出m的值;
(3)将该二次函数图象在点A,B之间的部分(含A,B两点)记为图象W.
①点Q在图象W上,连接
,
,求
面积的最大值;
②若直线
与图象W只有一个公共点,结合函数图象,直接写出c的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220f77f8740bcde0dfaa3b51b16f775d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/866ddfba-41bf-45e1-b3dc-ee7a52d6df6d.png?resizew=196)
(1)求该函数的表达式及顶点坐标;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2198978baa5a994212ecd40c2a6ad351.png)
(3)将该二次函数图象在点A,B之间的部分(含A,B两点)记为图象W.
①点Q在图象W上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008e80e33ba7b182a6d82862fadc8009.png)
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【推荐3】如图,在平面直角坐标系中,二次函数的图像与x轴交于A、B两点,与y轴交于点C,点A的坐标为
,点B的坐标为
.
(1)求此二次函数的解析式;
(2)动点D从点C出发,以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(3)点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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