如图,在平面直角坐标系中,抛物线
与x轴交于
、
两点,与y轴交于点C.
(1)求这条抛物线所对应的函数表达式.
(2)如图①,点D是x轴下方抛物线上的动点,且不与点C重合.设点D的横坐标为m,以O、A、C、D为顶点的四边形面积为S,求S与m之间的函数关系式.
(3)如图②,连结
,点M为线段
上一点,点N为线段
上一点,且
,直接写出当n为何值时
为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6109d39796845c833c05c4708951d53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c41a2e61da63ceb7e1ed328fe9817c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/3db3d6fc-3466-4ac2-a251-790b6ea7f490.png?resizew=315)
(1)求这条抛物线所对应的函数表达式.
(2)如图①,点D是x轴下方抛物线上的动点,且不与点C重合.设点D的横坐标为m,以O、A、C、D为顶点的四边形面积为S,求S与m之间的函数关系式.
(3)如图②,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/d75aa638a01d7827a2e5c95955bfe3e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
更新时间:2023-12-10 21:12:50
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【推荐1】如图,对称轴为直线
的抛物线经过点
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/5ec7a75d-37fc-4ec7-b0fa-e1aebcac9612.png?resizew=145)
(1)求抛物线解析式及顶点坐标;
(2)点
在第四象限抛物线的图像上,当平行四边形
的面积为24时,求点
的坐标;
(3)在直线
是否存在一点
,使得
与
相似,如存在求出点
坐标,如果不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b760c9b4e7c20265324b498b26cf43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/109a293cef44f23e86e22c1a4cfcbbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/5ec7a75d-37fc-4ec7-b0fa-e1aebcac9612.png?resizew=145)
(1)求抛物线解析式及顶点坐标;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ff91957e1d0c9facd6365086723d35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在直线
![](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/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】抛物线
交x轴于点
、点B,与y轴交于点
.
(2)如图1,连接
,点D是抛物线第四象限上一点,连接
交
于M,若
,求D点坐标;
(3)如图2,点E、F是抛物线上一点,过F作
于G,连接
,过G作
交直线
于H,试说明点H是否在一条直线上运动?若能,求出这条直线;若不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/e1b9ddeedeff87f7722aedd6c1109d57.png)
(3)如图2,点E、F是抛物线上一点,过F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080bf97f8bbf5cb8b68dad67295284f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐1】如图1,抛物线
与x轴交于A,B两点,与y轴交于点C,点D为线段AC的中点,直线BD与抛物线交于另一点E,与y轴交于点F.
(1)如图1,点P是直线BE上方抛物线上一动点,连接PD,PF,当△PDF的面积最大时,在线段BE上找一点G,使得PG﹣
EG的值最小,求出PG﹣
EG的最小值;
(2)如图2,点M为抛物线上一点,点N在抛物线的对称轴上,点K为平面内一点,当以点A、M、N、K为顶点的四边形是正方形时,直接写出点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda21869a325659ce6e7dea49fe1e13b.png)
(1)如图1,点P是直线BE上方抛物线上一动点,连接PD,PF,当△PDF的面积最大时,在线段BE上找一点G,使得PG﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
(2)如图2,点M为抛物线上一点,点N在抛物线的对称轴上,点K为平面内一点,当以点A、M、N、K为顶点的四边形是正方形时,直接写出点N的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/45df2682-c5c1-40e3-b9f5-5c1a657179b8.png?resizew=350)
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【推荐2】如图,在平面直角坐标系中抛物线
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479467898494976/2480304327188480/STEM/c402c185692449738f14735106de38fd.png?resizew=156)
(1)求此抛物线的函数表达式及点
的坐标;
(2)已知点
,在直线
上方的抛物线上有一动点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
,求
面积的最大值.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7291b3d921f595f28960abcdce6dfbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479467898494976/2480304327188480/STEM/c402c185692449738f14735106de38fd.png?resizew=156)
(1)求此抛物线的函数表达式及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96608330ee74ee791defc52cf18616d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3545346dfd07730d71d2e89d7079c6cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd51caff8d6cd6d3478fb4659789d8d.png)
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【推荐3】如图,已知直线y=﹣x+3与x轴、y轴分别交于A,B两点,抛物线y=﹣x2+bx+c经过A,B两点,点P在线段OA上,从点A以1个单位/秒的速度匀速运动;同时,点Q在线段AB上,从点A出发,向点B以
个单位/秒的速度匀速运动,连接PQ,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2019/5/8/2199227441520640/2205861362171904/STEM/63b69493009b4d1a9838ed3850c630ba.png?resizew=155)
(1)求抛物线的解析式;
(2)当t为何值时,△APQ为直角三角形;
(3)过点P作PE∥y轴,交AB于点E,过点Q作QF∥y轴,交抛物线于点F,连接EF,当EF∥PQ时,求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2019/5/8/2199227441520640/2205861362171904/STEM/fefadb14e67b4cfb8aa03c1ff3ac57dc.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/2019/5/8/2199227441520640/2205861362171904/STEM/63b69493009b4d1a9838ed3850c630ba.png?resizew=155)
(1)求抛物线的解析式;
(2)当t为何值时,△APQ为直角三角形;
(3)过点P作PE∥y轴,交AB于点E,过点Q作QF∥y轴,交抛物线于点F,连接EF,当EF∥PQ时,求点F的坐标.
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【推荐1】(1)【操作发现】
如图1,在矩形ABCD和矩形CEGF中,
=
,AB=9,AD=12,小明将矩形CEGF绕点C顺时针转一定的角度,如图2所示.
①问:
的值是否变化?若不变,求
的值;若变化,请说明理由.
②在旋转过程中,当点B、E、F在同一条直线上时,求AG的长度.
(2)【类比探究】
如图3,在△ABC中,AB=AC=2
,∠BAC=α°,tan∠ABC=
,G为BC中点,点D为平面内一动点,且DG=
,将线段BD绕点D逆时针旋转α°得到DB′,则四边形BACB′面积的最大值为______.
如图1,在矩形ABCD和矩形CEGF中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1c4b1882299ff153b826df9093bd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
①问:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec2c1bca9d89d16df525a45408aa76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec2c1bca9d89d16df525a45408aa76.png)
②在旋转过程中,当点B、E、F在同一条直线上时,求AG的长度.
(2)【类比探究】
如图3,在△ABC中,AB=AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/ecfed28c-3f3b-4f98-bf01-40eaee2189d6.png?resizew=505)
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【推荐2】如图1,平面直角坐标系xOy中,若A(0,4)、B(1,0)且以AB为直角边作等腰Rt△ABC,∠CAB=90°,AB=AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/2edb1634-336c-4fa1-9397-c567227ffc87.png?resizew=441)
(1)如图1,求C点坐标;
(2)如图2,在图1中过C点作CD⊥x轴于D,连接AD,求∠ADC的度数;
(3)如图3,点A在y轴上运动,以OA为直角边作等腰Rt△OAE,连接EC,交y轴于F,试问A点在运动过程中S△AOB:S△AEF的值是否会发生变化?如果没有变化,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/2edb1634-336c-4fa1-9397-c567227ffc87.png?resizew=441)
(1)如图1,求C点坐标;
(2)如图2,在图1中过C点作CD⊥x轴于D,连接AD,求∠ADC的度数;
(3)如图3,点A在y轴上运动,以OA为直角边作等腰Rt△OAE,连接EC,交y轴于F,试问A点在运动过程中S△AOB:S△AEF的值是否会发生变化?如果没有变化,请说明理由.
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【推荐1】如图,△ABC内接于⊙O,点D为⊙O上一点,连接BD、AD、CD,AD交BC于点E,作AG⊥CD于点G交BC于点F,∠ADB=∠ABC.
(1)如图1,求证:AB=AC;
(2)如图2.若BC为直径,求证:EF2=BE2+CF2
(3)如图在(1)的条件下,若∠ADC=60°,6CE=5BF,DG=
,求⊙O的半径长.
(1)如图1,求证:AB=AC;
(2)如图2.若BC为直径,求证:EF2=BE2+CF2
(3)如图在(1)的条件下,若∠ADC=60°,6CE=5BF,DG=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b307d8e4881f948a31e7957d71d41c.png)
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441555047415808/2442214213976064/STEM/846eb79182ca4836baf3612489e375ed.png?resizew=443)
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【推荐2】如图,
内接于
,
是
的直径,
,
是
的切线,点D是弧AC上一动点(点D不与点A,C重合),连接BD并延长交AC于点H,交CF于点E,连接AE,AD.
的面积;
(2)当
时,求
的长;
(3)若
的面积记为
,
的面积记为
,
的面积记为
,
的面积记为
,
,请用含k的代数式表示
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14252009a6dd4ced2746d25089bafb2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6697f92f42bf3ded6b5a13dd703fe032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e50ffaba29591d84ffa294bb817acae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6629fbe2eef7def1afa88acbbabdb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0021875474101de3e8eb71487c44b79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e582685d80fe91def7b770ddeb5fd30.png)
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