在平面直角坐标系
中,规定:抛物线
的伴随直线为
.例如:抛物线
的伴随直线为
,即
.
(1)在上面规定下,抛物线
的顶点为 ,伴随直线为 ;
(2)若顶点在第一象限的抛物线
与其伴随直线相交于点A,B(点A在点B的左侧),抛物线与x轴交于点C、D(点C在点D的左侧).
①若
求
的值;
②如果点
是直线BC上方抛物线的一个动点,
的面积记为S,当S取得最大值
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eaf9ba52ee4a71dba4db49503e864d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cbe1ec32f233dd0408ee5eff8dfb69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70645247e8fc4d4db7e18c28d47d2c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864180e9fe48e8b8e20bf486a9b85fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e212cdbfba6610bc55df2c1a737407.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/3ec075fe-3a6d-48e4-8a53-41626b75efb2.png?resizew=420)
(1)在上面规定下,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1cc9ace4455da07fbd5da0fbac1fbd.png)
(2)若顶点在第一象限的抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79049c41e25de9c5f2f3bafb9f88e1dc.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d876c494a89de1b52f19d07b362106c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-12-26 20:53:44
|
相似题推荐
【推荐1】如图,已知抛物线
的图象的顶点坐标是
,并且经过点
,直线
与抛物线交于
,
两点,以
为直径作圆,圆心为点
,圆
与直线
交于对称轴右侧的点
,直线
上每一点的纵坐标都等于1.
(1)求抛物线的解析式;
(2)证明:圆
与
轴相切;
(3)过点
作
,垂足为
,再过点
作
,垂足为
,求
的值.(或者求
的值)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad20e2bc6576fc461419f8f138d26e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081cd41dab0f2a8f84b0e9f1df4843fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6c4cd7613e0339ff44fcfce4113fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865fcb784d040dff9af273ceda8fc98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求抛物线的解析式;
(2)证明:圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d6a943182ccb54e20ba8ba0d49e2f3.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/c321ce83f4d8a00133ce34a8a5a74fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8da00e44f803e3e3fadbd741d6074e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/491f2e67-3723-4215-a4b7-760baa068e04.png?resizew=180)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知抛物线
和抛物线
(n为正整数).
(1)抛物线
与x轴的交点坐标为 .顶点坐标为 .
(2)当n=1时,请解答下列问题:
①抛物线
与x轴的交点坐标为 .顶点坐标为 .请写出抛物线y,
的一条相同的性质.
②当直线
与抛物线y,
,共有4个交点时,求m的取值范围
(3)若直线y=k(k<0)与抛物线y,
共有4个交点,从左至右依次标记为点A,B,C,D,当AB=BC=CD时,求出k,n之间满足的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f48a212d817c2b4859c54885d1d9e86.png)
(1)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
(2)当n=1时,请解答下列问题:
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
②当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80e3a3b6c6513a45506f605638f5655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
(3)若直线y=k(k<0)与抛物线y,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】如图(1),矩形ABCD,AB=2cm,AD=6cm,P、Q分别为两个动点,点Q从B出发沿边B—A—D运动,每秒2cm,点P从B出发沿边BC运动,每秒1cm.
(1)若P、Q两点同时出发,其中一点到达终点时另一点也随之停止,设△BPQ面积为S,时间为t秒,求S关于t的函数关系式及自变量的取值范围;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/03f8f357-7db9-4521-9cb9-f61cdfd29532.png?resizew=362)
(2)若R为AD中点,连接RP、RQ,当以R、P、Q为顶点的三角形与△BPQ相似(含全等)时,求t的值;
(3)如图(2)M为AD边上一点,AM=2,点Q在1.5秒时便停止运动,点P继续在BC上运动,AP与BQ交于点E,PM交CQ于点F,设四边形QEPF的面积为y,求y的最大值.
(1)若P、Q两点同时出发,其中一点到达终点时另一点也随之停止,设△BPQ面积为S,时间为t秒,求S关于t的函数关系式及自变量的取值范围;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/03f8f357-7db9-4521-9cb9-f61cdfd29532.png?resizew=362)
图(1)
(2)若R为AD中点,连接RP、RQ,当以R、P、Q为顶点的三角形与△BPQ相似(含全等)时,求t的值;
(3)如图(2)M为AD边上一点,AM=2,点Q在1.5秒时便停止运动,点P继续在BC上运动,AP与BQ交于点E,PM交CQ于点F,设四边形QEPF的面积为y,求y的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/bc7ab811-6b0e-4b05-ae80-581ba22cc47b.png?resizew=364)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图①,抛物线
与
轴交于
,
,与
轴交于点
.已知直线
过
,
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/1c3d6517-ad49-4f1f-95a3-2901e03b9b09.png?resizew=535)
(1)求抛物线和直线
的表达式;
(2)点
是抛物线上的一个动点,
①如图①,若点
为抛物线顶点,连接
,交直线
于点
.求
的面积。
②如图②,抛物线的对称轴
与
轴交于点
,过点
作
,垂足为
.点
是对称轴
上的一个动点,是否存在以点
,
,
,
为顶点的四边形是平行四边形?若存在,求出点
,
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415ce7008a89ffca8c3c3edbf13a935e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.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/95f8ef5ab6007dcbc90d01031eb42e2b.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/2023/12/11/1c3d6517-ad49-4f1f-95a3-2901e03b9b09.png?resizew=535)
(1)求抛物线和直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①如图①,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
②如图②,抛物线的对称轴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次