1 . 如图,△ABC为等边三角形,AB=6,将边AB绕点A顺时针旋转
(0°<
<120°)得到线段AD,连接CD,CD与AB交于点G,∠BAD的平分线交CD于点E,F为CD上一点,且DF=2CF.
(1)当∠EAB=30°时,求∠AEC的度数;
(2)当线段BF的长取最小值时,求线段AG的长;
(3)请直接写出△ADE的周长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(1)当∠EAB=30°时,求∠AEC的度数;
(2)当线段BF的长取最小值时,求线段AG的长;
(3)请直接写出△ADE的周长的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/3529420f-6800-4478-9b6c-2f9a5b587482.png?resizew=226)
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解答题-问答题
|
较难(0.4)
|
2 . 如图,⊙O的半径为1,等腰直角三角形ABC的顶点B固定且坐标为(
,0),顶点A在⊙O上运动,始终保持
CAB=90°,AC=AB
(1)当点A在x轴上时,求点C的坐标;
(2)当点A运动到x轴的负半轴上时,试判断直线BC与⊙O位置关系,并说明理由;
(3)设点A的横坐标为x,△ABC的面积为S,求S与x之间的函数关系式,并求出S的最大值与最小值;
(4)当直线AB与⊙O相切时,求AB所在直线对应的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
(1)当点A在x轴上时,求点C的坐标;
(2)当点A运动到x轴的负半轴上时,试判断直线BC与⊙O位置关系,并说明理由;
(3)设点A的横坐标为x,△ABC的面积为S,求S与x之间的函数关系式,并求出S的最大值与最小值;
(4)当直线AB与⊙O相切时,求AB所在直线对应的函数关系式.
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647770483597312/1652861047259136/STEM/6175ee433a944519a6693d998f90d06a.png?resizew=182)
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真题
3 . 如图
中,
,
为
中点,若点
为直线
下方一点,且
与
相似,则下列结论:①若
,
与
相交于
,则点
不一定是
的重心;②若
,则
的最大值为
;③若
,则
的长为
;④若
,则当
时,
取得最大值.其中正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafbd0cf0b29369d2eed68bf81ce410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8a9249c8cc269f1c3c3941a222fd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76b1d9e02eb41f22d851ad8f13daabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe498c98e6b0cadfe2510c8b91301801.png)
A.①④ | B.②③ | C.①②④ | D.①③④ |
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2023-07-06更新
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13卷引用:2023年江苏省无锡市中考数学真题
2023年江苏省无锡市中考数学真题 2024年江苏省无锡市中考数学模拟预测题(已下线)重难点01 三角形综合(8大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(江苏专用)(已下线)查补培优冲刺02 几何最值类综合压轴-【查漏补缺】2024年中考数学复习冲刺过关(江苏专用)(已下线)专题17 几何压轴题-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)(已下线)专题32 函数与几何综合问题(共10道)-学易金卷:2023年中考数学真题分项汇编(全国通用)安徽省安庆市潜山市2023-2024学年八年级上学期月考数学试题河南省周口市淮阳区2023-2024学年九年级上学期12月月考数学试题23-相似三角形广东省深圳市深大附中教育集团2023-2024学年九年级下学期开学考数学试题(已下线)第1讲 相似三角形广东省江门市蓬江区杜阮镇楼山初级中学2023-2024学年九年级下学期第一次月考数学试题(已下线)2024年中考数学考前综合模拟检测卷02(全国通用)-备战2024年中考数学真题题源解密(全国通用)
4 . 如图,
是⊙O的弦,
,点C是⊙O上的一个动点,且
,若点M,N分别是
,
的中点,则⊙O的半径是__________ ,图中阴影部分面积的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/3/24/2942980372455424/2964183448756224/STEM/2ccd0362e86f4b72a4398c77c555b8e5.png?resizew=147)
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名校
5 . 如图,抛物线
与x轴交于点A,B,与y轴交于点
,
.直线
交
于点D,点P是直线
下方抛物线上一动点,连接
.
(1)求此抛物线的解析式;
(2)如图1,连接
,求
面积的最大值及此时点P的坐标;
(3)如图2,连接
,过点P作
于点E,是否存在点P使以P,D,E三点为顶点的三角形与
相似,若存在,直接写出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc24a34748ce26ac22675e5d4007653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d6e498b0c1d1cedb86fe548f9fe79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b13e14899f84d237be52d26948abb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/67478830-3332-4ea1-ba0e-23958da618b8.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/c3f6acb3-7a78-4715-8ff8-b68332a84e23.png?resizew=241)
(1)求此抛物线的解析式;
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2020-12-09更新
|
699次组卷
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4卷引用:江苏省淮安外国语学校2020~2021学年九年级上学期阶段性教学质量调研数学试题
6 . 如图,
是
的切线,
为切点,
,
,点
是
上的一个动点,连结
并延长,交
的延长线于
,则
的最大值为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2020/3/15/2419924240916480/2420329788940289/STEM/eadaae89-b97c-4ced-ae78-50733fc3282b.png)
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7 . 已知⊙O的半径为2,A为圆内一定点,AO=1.P为圆上一动点,以AP为边作等腰△APG,AP=PG,∠APG=120°,OG的最大值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/19fa2079-98ae-4f41-b22b-46b2df63bf9f.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/19fa2079-98ae-4f41-b22b-46b2df63bf9f.png?resizew=209)
A.1+![]() | B.1+2![]() | C.2+![]() | D.2![]() |
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2020-05-20更新
|
610次组卷
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5卷引用:2020年江苏省昆山九校联考中考数学模拟试题
2020年江苏省昆山九校联考中考数学模拟试题江苏省宿迁市钟吾国际学校2020—2021学年九年级上学期第二次学情调研数学试题(已下线)【万唯原创】最值问题·基础专练(已下线)【万唯原创】2021年河北试题研究-讲册第二部分-专题四微专题 最值问题广东省梅州市丰顺县丰顺县三友中学2022-2023学年九年级上学期12月月考数学试题
8 . 如图,直线
与
轴、
轴分别相交于点B、C,经过B、C两点的抛物线
与
轴的另一个交点为A,顶点为P,且对称轴为直线
。点G是抛物线
位于直线
下方的任意一点,连接PB、GB、GC、AC .
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372118402449408/2372842933141504/STEM/04857b418fdf4f369a73e00b7ed3d095.png?resizew=170)
(1)求该抛物线的解析式;
(2)求△GBC面积的最大值;
(3)连接AC,在
轴上是否存在一点Q,使得以点P,B,Q为顶点的三角形与△ABC相似?若存在,求出点Q的坐标;若不存在,请说明理由。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.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/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372118402449408/2372842933141504/STEM/04857b418fdf4f369a73e00b7ed3d095.png?resizew=170)
(1)求该抛物线的解析式;
(2)求△GBC面积的最大值;
(3)连接AC,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2020-01-08更新
|
298次组卷
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2卷引用:2020年江苏省盐城市建湖县中考数学一模试题
9 . 如图,正方形
中,
,
,点
在
上运动(不与
重合),过点
作
交
于点
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7949a50146e4db34087db056c4de2683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12eb814bb12c2e8d3c6de69a73e972ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c666d543c79d9054fc2614685ccec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/ad9e674d-e15f-4a06-a8b2-dde3722cbeab.png?resizew=147)
A.3 | B.4 | C.2 | D.1 |
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真题
10 . 如图,二次函数
的图象与
轴交于点
和点
,与
轴交于点
,以
为边在
轴上方作正方形
,点
是
轴上一动点,连接
,过点
作
的垂线与
轴交于点
.
(1)求该抛物线的函数关系表达式;
(2)当点
在线段
(点
不与
重合)上运动至何处时,线段
的长有最大值?并求出这个最大值;
(3)在第四象限的抛物线上任取一点
,连接
.请问:
的面积是否存在最大值?若存在,求出此时点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求该抛物线的函数关系表达式;
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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(3)在第四象限的抛物线上任取一点
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2019-07-18更新
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1482次组卷
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8卷引用:江苏省盐城市滨海县2019-2020学年中考4月第一次学情研判数学试题