在平面直角坐标系中,抛物线
与y轴交于点
,与x轴交于点
和点C,抛物线的顶点为P.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/e5654723-6a25-4d40-bce1-28c00e70201a.png?resizew=117)
(1)求此抛物线的解析式和顶点P的坐标;
(2)若点D,E均在此抛物线上,其横坐标分别为m,
(
).且D,E两点的纵坐标的差为8.
①求m的值;
②将点C向上平移2m个单位得到点
,将抛物线沿x轴向右平移n个单位得到新抛物线,点D的对应点为点
,点E的对应点为点
,顶点P的对应点为点
,在抛物线平移过程中,求
的最小值,并求出新抛物线的顶点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96dde9c4aad0536c069127df0d4b12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec0bc3a43265b63b6964476ca327fab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/e5654723-6a25-4d40-bce1-28c00e70201a.png?resizew=117)
(1)求此抛物线的解析式和顶点P的坐标;
(2)若点D,E均在此抛物线上,其横坐标分别为m,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
①求m的值;
②将点C向上平移2m个单位得到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5799e4298966c48367bff087adf11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
更新时间:2024-02-26 09:40:49
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【推荐1】已知对称轴为直线
的抛物线
(
)经过原点
,与
轴交于另一点
.
(1)求
,
满足的关系式;
(2)若点
为抛物线的顶点,
为等腰直角三角形.
①求抛物线的解析式;
②点
,
均在抛物线的对称轴上,且
.过点
作
轴的平行线
,连接
、
,延长
交抛物线于点
,延长
交直线
于点
,连接
.若点
的横坐标为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
①求抛物线的解析式;
②点
![](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/f4acd79bb9fb06f7c806eb6e17e4b613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad2b7c8fce8c9539b208400cdb8cba9.png)
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【推荐2】已知抛物线
:
与x轴交于A、B两点,与y轴交于点C,
为等腰直角三角形,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/44e6f868-db78-40ad-8a0d-2d276e80f1a5.png?resizew=342)
(1)求抛物线
的解析式;
(2)将
向上平移一个单位得到
,点M、N为抛物线
上的两个动点,O为坐标原点,且
,连接点M、N,过点O作
于点E,求点E到y轴距离的最大值;
(3)如图,若点F的坐标为
,直线l分别交线段
,
(不含端点)于G、H两点.若直线l与抛物线
有且只有一个公共点,设点G的横坐标为b,点H的横坐标为a,则
是定值吗?若是,求出定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a5baff378f391aa2eb89f9435e2072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4561e662151983a27b3e8c8fcc857f06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/44e6f868-db78-40ad-8a0d-2d276e80f1a5.png?resizew=342)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)将
![](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://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58ea0ce86a0e68862debe510dbca1a6.png)
(3)如图,若点F的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803dc3c76fd2b51696647aa18602412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
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【推荐1】如图,在平面直角坐标系
中,一次函数
的图象与反比例函数
的图象相交于
,B两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/3343537a-119b-452a-a420-918875d5115c.png?resizew=440)
(1)求反比例函数的表达式及点B的坐标;
(2)过点A作直线
,交反比例函数图象于另一点C,连接
,当线段
被y轴分成长度比为
的两部分时,求
的面积;
(3)我们把有两个内角是直角,且一条对角线垂直平分另一条对角线的四边形称为“完美筝形”.设P是第四象限内的反比例函数图象上一点,Q是平面内一点,当四边形
是完美筝形时,求P,Q两点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b966f2b610aeab2b7993a0fa42cfc543.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/3343537a-119b-452a-a420-918875d5115c.png?resizew=440)
(1)求反比例函数的表达式及点B的坐标;
(2)过点A作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed956015248ff88944d0e1107d11be90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4806fb7f95f63e863c287faa51f8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
(3)我们把有两个内角是直角,且一条对角线垂直平分另一条对角线的四边形称为“完美筝形”.设P是第四象限内的反比例函数图象上一点,Q是平面内一点,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712d9d9e29645c1df6ae23125b4aa1cc.png)
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【推荐2】如图,直线
与x轴、y轴分别相交于点C、B,与直线
相交于点A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/a16bc672-5307-4546-8e28-dcc06b8396a2.png?resizew=214)
(1)求A点坐标;
(2)在直线
上是否存在点Q,使
的面积等于6?若存在,请求出Q点的坐标,若不存在,请说明理由.
(3)如果在y轴上存在一点P,使得
为等腰三角形,求P点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0165a56c373fabb4bcf7b1266736d766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02430f83e4f662e788d234da3c56ce2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/a16bc672-5307-4546-8e28-dcc06b8396a2.png?resizew=214)
(1)求A点坐标;
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0165a56c373fabb4bcf7b1266736d766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda3804b1fa07570002ac27483947fc2.png)
(3)如果在y轴上存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
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【推荐3】(1)问题发现:
如图①,在平面直角坐标系中,已知点
和点
则线段
的长为______;
(2)问题探究:
如图②,在平面直角坐标系中,已知点
,
为等边三角形,点A在第一象限,点
在线段
上,点M,N分别是边
,
上两点,求
周长的最小值.
(提示:在直角三角形中,
角所对的直角边是斜边的一半.)
(3)问题解决:
为迎接国庆节,西安市园林绿化部门准备在一块正方形的空地
上用鲜花摆放一个四边形的图案.设计员小华将其置于如图③所示的平面直角坐标系中,已知点
,点A,C在坐标轴上,绿化部门计划在正方形
内围成一个如图所示的四边形
,在其内部摆放花卉图案,其余地方种植草坪.要求N,P在边
上,M在
上,且
.请问是否存在点P,N,使得四边形
的周长最小?若存在,请求出最小值?如不存在,请说明理由.
如图①,在平面直角坐标系中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5f2bba8303c05689ef4538e98e8929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)问题探究:
如图②,在平面直角坐标系中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbdef5d0c05acbf63fa72fa85c5bb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a56e5ddc6dc057aa4076130cc6ce19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
(提示:在直角三角形中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
(3)问题解决:
为迎接国庆节,西安市园林绿化部门准备在一块正方形的空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092154649446ed6e55dd78136461acb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8183037dd851accc1331ec5677b69bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b088de4bdaf9eec6754dd4f43e7798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8183037dd851accc1331ec5677b69bff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/6d94846e-f95e-49e5-94f2-f475ad49686c.png?resizew=510)
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【推荐1】如图1,在平面直角坐标系中.直线l1:y=﹣x+3与直线l2:y=﹣x﹣6交于点A,已知点A的横坐标为﹣
,直线l1与x轴交于点B,与y轴交于点C,直线l2与x轴交于点F,与y轴交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/02014427-3c05-4f04-9b5a-016704897a1d.png?resizew=515)
(1)求直线l1的解析式;
(2)将直线l2向上平移
个单位得到直线l3,直线l3与y轴交于点E.过点E作y轴的垂线l4,若点M为垂线l4上的一个动点,点N为l2上的一个动点,求DM+MN的最小值;
(3)已知点P、Q分别是直线l1,l2上的两个动点,连接EP、EQ、PQ,是否存在点P、Q,使得
EPQ是以点Q为直角顶点的等腰直角三角形,若存在,求点Q的坐标若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a85a2c984df17f7ef91d014d931410d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/02014427-3c05-4f04-9b5a-016704897a1d.png?resizew=515)
(1)求直线l1的解析式;
(2)将直线l2向上平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
(3)已知点P、Q分别是直线l1,l2上的两个动点,连接EP、EQ、PQ,是否存在点P、Q,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐2】在平面直角坐标系中,对于点
,
,当
时,将点P向右平移c个单位,当
时,将点P向左平移
个单位,得到点
,再将点
关于直线
对称得到点M,我们称点M为点P关于点Q的跳跃点.
例如,如图1,已知点
,
,点P关于点Q的跳跃点为
.
(1)已知点
,
,
①若点C为点A关于点B的跳跃点,则点C的坐标为______.
②若点A为点B关于点C的跳跃点,则点C的坐标为______.
(2)已知点D在直线
上,点D的横坐标为m,点E的坐标为
.
①点K为点E关于点D的跳跃点,若
的面积为4,直接写出m的值;
②点E向上平移1个单位得到点F,以
一边向右作正方形
,点R为正方形
的边上的一个动点,在运动过程中,直线
上存在点D关于点R的跳跃点,请直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee07c1f2f7b417036b79f165d4fe24c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647ffc3291900b80c4c5460e49747c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b9d9315539052dd2e4a67066d8de1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f2c07b5f727b634bfc5eeed6314b5f.png)
例如,如图1,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c21b59d92c33a3b451d6cc13878c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fdf0b6fecd6a78bc83f42e11e60a004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd9b8bc0e91799e2240a5e6438036d73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/b1239dbd-4e31-4b80-ae24-82aceb632732.png?resizew=588)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12250671549c5d79588e1084d2bcbe50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518e169225db002fab78a977b4ceb2a2.png)
①若点C为点A关于点B的跳跃点,则点C的坐标为______.
②若点A为点B关于点C的跳跃点,则点C的坐标为______.
(2)已知点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466ad56974a1080588717a3e735207e2.png)
①点K为点E关于点D的跳跃点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5ca1ba5bc926ae6861e71c5b6cb6d0.png)
②点E向上平移1个单位得到点F,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
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【推荐3】如图,在平面直角坐标系中,点O为坐标原点,点
的横坐标m与纵坐标n满足
,过点A作x轴的垂线,垂足为点D,点E在x轴的负半轴上,且
,连接
,线段
与y轴相交于点F,
的面积为32.
(2)将线段
向右平移n个单位长度,得到线段
,在线段
上有一点G,连接
,如果
的面积为56,求
的长;
(3)在(2)的条件下,动点P从点C出发,以每秒6个单位长度的速度沿折线
轴负半轴,方向运动,动点Q从点C出发,以每秒1个单位长度的速度沿线段
,向终点B匀速运动,已知两个点同时出发,一个点停止运动,同时另一个点也停止运动,如果
的面积是
的面积的6倍,求出t值及点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8362d054a769c541ee707e0c06cc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c308d00bfb3d2d66b64bea16e022451d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
(2)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7635680fefd93dd95274c933b5289c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
(3)在(2)的条件下,动点P从点C出发,以每秒6个单位长度的速度沿折线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8339b80d1ba6670300f70c8e7a5dedb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50efda6659461c7482e106c5b1774072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3d9b80bcd4da8eb425a63ed21e9b42.png)
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【推荐1】如图,二次函数y=ax2+bx﹣12的图象交x轴于A(﹣3,0),B(5,0)两点,与y轴交于点C.点D是抛物线上的一个动点.
(1)求抛物线的解析式;
(2)设点D的横坐标为m,并且当m≤x≤m+5时,对应的函数值y满足﹣
m,求m的值;
(3)若点D在第四象限内,过点D作DE∥y轴交BC于E,DF⊥BC于F.线段EF的长度是否存在最大值?若存在,请求出这个最大值及相应点D的坐标;若不存在,请说明理由.
(1)求抛物线的解析式;
(2)设点D的横坐标为m,并且当m≤x≤m+5时,对应的函数值y满足﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7403157f8e63b58a97f7c0167f31182.png)
(3)若点D在第四象限内,过点D作DE∥y轴交BC于E,DF⊥BC于F.线段EF的长度是否存在最大值?若存在,请求出这个最大值及相应点D的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/8/4/2261718159253504/2263595935219712/STEM/b2286fdc03de431f821c0f5d35e548a0.png?resizew=187)
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【推荐2】如图1,已知抛物线y=﹣x2+2x+3与x轴交于A、B两点,与y轴交于点C,顶点为D,连接BC
![](https://img.xkw.com/dksih/QBM/2019/5/30/2214753454923776/2215786249658368/STEM/2e27a3670b3b46bbaea526401762b07f.png?resizew=455)
(1)点G是直线BC上方抛物线上一动点(不与B、C重合),过点G作y轴的平行线交直线BC于点E,作GF⊥BC于点F,点M、N是线段BC上两个动点,且MN=EF,连接DM、GN.当△GEF的周长最大时,求DM+MN+NG的最小值;
(2)如图2,连接BD,点P是线段BD的中点,点Q是线段BC上一动点,连接DQ,将△DPQ沿PQ翻折,且线段D′P的中点恰好落在线段BQ上,将△AOC绕点O逆时针旋转60°得到△A′OC′,点T为坐标平面内一点,当以点Q、A′、C′、T为顶点的四边形是平行四边形时,求点T的坐标.
![](https://img.xkw.com/dksih/QBM/2019/5/30/2214753454923776/2215786249658368/STEM/2e27a3670b3b46bbaea526401762b07f.png?resizew=455)
(1)点G是直线BC上方抛物线上一动点(不与B、C重合),过点G作y轴的平行线交直线BC于点E,作GF⊥BC于点F,点M、N是线段BC上两个动点,且MN=EF,连接DM、GN.当△GEF的周长最大时,求DM+MN+NG的最小值;
(2)如图2,连接BD,点P是线段BD的中点,点Q是线段BC上一动点,连接DQ,将△DPQ沿PQ翻折,且线段D′P的中点恰好落在线段BQ上,将△AOC绕点O逆时针旋转60°得到△A′OC′,点T为坐标平面内一点,当以点Q、A′、C′、T为顶点的四边形是平行四边形时,求点T的坐标.
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