已知抛物线
与
轴交于点
和点
,与
轴交于点
.
(1)求抛物线的解析式;
(2)如图,连接
为
的中点,
,
在
的同侧以
为中心旋转,
交
轴于点
,
交
轴于点
。设
的长为
,
的长为
,求
和
之间的函数关系式;
(3)在(2)的条件下,当四边形
的面积
的值最大时,抛物线
与
轴相交于点
,与
轴负半轴相交于点
,若
为直角三角形,求
的值.
(参考公式:均值不等式:若
,则
,当且仅当
时取“=”.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95e84f5c91c910aaafc5e74dbfbdf59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c77a42750684cb6157c2c7fb9422a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/6384605b-245b-4b1f-8aec-bef8cdd18804.jpg?resizew=174)
(1)求抛物线的解析式;
(2)如图,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2af9579b1f20124f4390f7cd40ec8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681928c8d7edb4ce54c2b7d924528526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec85ddeb8966070952660b1db18b65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93a232c88870d213a7b74a796a1ff4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在(2)的条件下,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1547facc68035a0190ea41bd0eb6345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7080a7b9b9b35ecc9ad6dcba0b72d5e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c35cffd84e271d55ceee4cffbba8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(参考公式:均值不等式:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689f982af451283289255c87593ec338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
更新时间:2020-01-01 09:52:23
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,抛物线
与
轴交于
两点,与
轴交于点
.
(1)直接写出抛物线的解析式,并求点
的坐标.
(2)点
为第一象限内抛物线上的一动点,作
轴于点
,交
于点
,过点
作
的垂线与抛物线的对称轴和
轴交于点
,设点
的横坐标为
.
①求
的最大值;
②连接
,若
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca97516f9b88fcba781529e7b8823e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/1ef79e6d-9834-4902-b86f-56f07f84fc58.png?resizew=357)
(1)直接写出抛物线的解析式,并求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83fd42df335c85bf92b7961b9851977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832eca288ea293748bc05e57a0dade01.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c06f5c9f75bd16c95d60b17d39c55a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
【推荐2】如图,过点
的抛物线
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/664a88ad-9c0c-4c64-8a72-bc93e405b0d6.png?resizew=323)
(1)求该抛物线的表达式;
(2)连接
,
,点
为直线
下方抛物线上一动点,点
与点
关于
轴对称,分别过
,
作
轴的平行线交
于点
,
,求
的最大值及此时点
的坐标;
(3)另一条过点
的抛物线
的顶点
位于直线
上,该抛物线与
轴的另一交点为点
,连接
,
,若
,请直接写出满足条件的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e014e05a7c454a8a506ce1d5a0c595d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/664a88ad-9c0c-4c64-8a72-bc93e405b0d6.png?resizew=323)
(1)求该抛物线的表达式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/d053b14c8588eee2acbbe44fc37a6886.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8068e0391bcbdd7d5a7603d4d08cc66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)另一条过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.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/ad895b1c422b40c35be89c8bef22e834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea8578ed02bbdaa1d8838483dbae5cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18cc471ba2644b13ddcac09aa18b990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
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解答题-证明题
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较难
(0.4)
【推荐1】如图,矩形OBCD位于直角坐标系中,点B(
,0),点D(0,m)在y轴正半轴上,点A(0,1),BE⊥AB,交DC的延长线于点E,以AB,BE为边作▱ABEF,连结AE.
(1)当m=
时,求证:四边形ABEF是正方形.
(2)记四边形ABEF的面积为S,求S关于m的函数关系式.
(3)若AE的中点G恰好落在矩形OBCD的边上,直接写出此时点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)当m=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)记四边形ABEF的面积为S,求S关于m的函数关系式.
(3)若AE的中点G恰好落在矩形OBCD的边上,直接写出此时点F的坐标.
![](https://img.xkw.com/dksih/QBM/2019/7/5/2240499289841664/2241251280633856/STEM/542a9b821b2b4de89e28d3666fc3cdd8.png?resizew=116)
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【推荐2】已知抛物线y=﹣x2+bx+c的对称轴为直线x=1,其图象与x轴相交于A,B两点,与y轴相交于点C(0,3).
(1)求b,c的值;
(2)直线l与x轴相交于点P.
①如图1,若l∥y轴,且与线段AC及抛物线分别相交于点E,F,点C关于直线x=1的对称点为点D,求四边形CEDF面积的最大值;
②如图2,若直线l与线段BC相交于点Q,当△PCQ∽△CAP时,求点P的坐标.
(1)求b,c的值;
(2)直线l与x轴相交于点P.
①如图1,若l∥y轴,且与线段AC及抛物线分别相交于点E,F,点C关于直线x=1的对称点为点D,求四边形CEDF面积的最大值;
②如图2,若直线l与线段BC相交于点Q,当△PCQ∽△CAP时,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/e232ac97-8dba-498c-b025-572c4683b8c0.png?resizew=407)
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【推荐1】如图1,抛物线y=﹣
与x轴交于A、B两点,与y轴交于点C,连接AC、BC.
(1)求线段AC的长;
(2)如图2,E为抛物线的顶点,F为AC上方的抛物线上一动点,M、N为直线AC上的两动点(M在N的左侧),且MN=4,作FP⊥AC于点P,FQ∥y轴交AC于点Q.当△FPQ的面积最大时,连接EF、EN、FM,求四边形ENMF周长的最小值.
(3)如图3,将△BCO沿x轴负方向平移
个单位后得△B'C'O',再将△B'C'O'绕点O'顺时针旋转α度,得到△B″C″O'(其中0°<α<180°),旋转过程中直线B″C″与直线AC交于点G,与x轴交于点H,当△AGH是等腰三角形时,求α的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42baad20eaf18683efaf7efee0cd1d59.png)
(1)求线段AC的长;
(2)如图2,E为抛物线的顶点,F为AC上方的抛物线上一动点,M、N为直线AC上的两动点(M在N的左侧),且MN=4,作FP⊥AC于点P,FQ∥y轴交AC于点Q.当△FPQ的面积最大时,连接EF、EN、FM,求四边形ENMF周长的最小值.
(3)如图3,将△BCO沿x轴负方向平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/3/16/2161640380637184/2163398035431424/STEM/c42bc6ae176944fc9377e0570e6df975.png?resizew=325)
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【推荐2】定义:在平面直角坐标系中,直线
称为抛物线
的伴随直线,如直线
为抛物线
的伴随直线.
(1)求抛物线
的伴随直线;
(2)无论
取何值,抛物线
:
总会经过某定点,抛物线
:
的伴随直线经过该定点,求
的值;
(3)顶点在第一象限的抛物线
与它的伴随直线交于点
,
(点
在点
的左侧),与
轴负半轴交于点
,当
时,
轴上存在点
,使得
取得最大值,求此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76385b33b8e9a9a307f8f7d8bb735935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ddc0a29bfef85c1441d02ff117a183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a850b08cd29c65f78b0685d98a083f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e8cc96f811dd4c7617c6e58ba18012.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea47f0d05aa53100f96afbf911d7254a.png)
(2)无论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fb20059e28ed8301230fc9de1b06af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/659c673e04aa9c4f5e98203ad54d441a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)顶点在第一象限的抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd03cd77d710210e4c56d9b8a17d307d.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/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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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