名校
1 . 如图1,已知菱形
的边长为6,
, 点
、
分别是边
、
上的动点(不与端点重合),且
.
(1)求证:
是等边三角形;
(2)点
、
在运动过程中,四边形
的面积是否变化,如果变化,请说明理由;如果不变,请求出面积;
(3)当点
在什么位置时,
的面积最大,并求出此时面积的最大值;
(4)如图2,连接
分别与边
、
交于
、
,当
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
(2)点
![](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/910936ec9fb419d51ce2f5ea817f8401.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca1afb3915b4e110c916a91b3188270.png)
(4)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/6c3c13d921d69e148a91ff7a46f657ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f416a19e6bc5baccd6154daced967a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/74d3575c-cc1b-47cc-acac-3192bb668f79.png?resizew=330)
您最近一年使用:0次
名校
解题方法
2 . 在
中,
,
,
.动点
分别从点
同时出发,点
以每秒1个单位的速度沿
匀速运动.点
沿折线
向终点
匀速运动,在
上的速度分别是每秒
个单位、每秒2个单位.当点
停止时,点
也随之停止运动.连按
,将
绕着点
逆时针旋转
得到
,连按
,设点
的运动时间为
.
(1)用含
的代数式表示
的长.
(2)当点
与
的顶点重合时,求
的长.
(3)设
的面积为
,求
与
之间的函数关系式.
(4)点
出发后,当
与
的边所夹的角被
平分时,直按写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da29d86fc0d5c800ad492119bfeb16ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af70b81a82bd25f041bebf35933cc7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf2ae3437f10c090c273b2bdb239eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf2ae3437f10c090c273b2bdb239eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/5/5/2456242036965376/2456804739063808/STEM/f3b556da-0ab6-4a37-82b6-3e039139d443.png)
您最近一年使用:0次
名校
3 . 如图,已知在四边形
中,
,
,
,
,则四边形
面积的最小值是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f64e406dc7dc9a0eae578aca97ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6632e560ba01142f8ecf06255812c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d2d1952f493ffc29012eb9dc06c26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4fc2d383876afe5be1103352571805b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/3670949d-3aa3-4ff3-922e-814929633455.png?resizew=142)
您最近一年使用:0次
2020-05-03更新
|
333次组卷
|
11卷引用:2020年陕西省西安市高新一中九年级数学一模试题
2020年陕西省西安市高新一中九年级数学一模试题(已下线)【万唯原创】2019年陕西省中考试题-试题研究讲册正文-第一部分第六章1下(已下线)【万唯原创】2019年陕西省中考试题-数学选填-第一部分题型19(已下线)2018年陕西省-专版-西安市爱知中学模拟考试1(已下线)【万唯原创】2018年陕西省-试题研究-陕西中考考点研究24(已下线)【万唯原创】2020年陕西-试题研究-第一部分 陕西中考考点研究19(已下线)【万唯原创】2020年陕西省-面对面-选填重难专题-专题3+4(已下线)【万唯原创】2021年陕西省试题研究-练册-第六章4(已下线)【万唯原创】2021年山西专项集训-选填题组训练3浙江省金华市义乌市后宅中学2020-2021学年九年级下学期期中数学试题2022年陕西省西安市高新区逸翠园学校中考十二模数学试题
名校
4 . 如图,AOB120°,MPN 60°, OP平分AOB,点 M、N 分别在射线 OA,OB 上(都不与点 O 重合),∠MPN 绕着点 P 转动, OP 与 MN 交于点 G, OP10,当 MN取得最小值时, OGN 的面积为_____
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443383852400640/2443634315108352/STEM/906cbbd85f5540cdb2327f7ed3e6a641.png?resizew=220)
您最近一年使用:0次
5 . 如图,平行四边形
中,
平分
,交
于点
,且
,延长
与
的延长线交于点
,连接
,
.下列结论:①
;②
是等边三角形;③
;④
;⑤
中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa400a2285440793cd15659c1e42394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac85be72fc51ef4c90de7e00c5556cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38f1fe8710ca575dea44cdd72a6dd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20274094b987dc33fe7b1f9e45b0457f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/13bc0372-ec1b-44b8-a6aa-241ba09ba342.png?resizew=207)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
6 . 如图,⊙O是△ABC的外接圆,过点A、B两点分别作⊙O的切线PA、PB交于一点P,连接OP
(1)求证:∠APO=∠BPO;
(2)若∠C=60°,AB=6,点Q是⊙O上的一动点,求PQ的最大值.
(1)求证:∠APO=∠BPO;
(2)若∠C=60°,AB=6,点Q是⊙O上的一动点,求PQ的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/463794df-354a-4059-bc5d-f3e63f90eec7.jpg?resizew=128)
您最近一年使用:0次
2020-04-14更新
|
20次组卷
|
8卷引用:2013年陕西省初中毕业学业考试(副题)
(已下线)2013年陕西省初中毕业学业考试(副题)(已下线)【万唯原创】2017年陕西-面对面正文-教材知识梳理22(已下线)【万唯原创】2015年陕西省-题型-第一部分题型7上(已下线)【万唯原创】2015年陕西省-面对面正文-第六章2+3(已下线)【万唯原创】2015年陕西省-试题研究正文-第一部分 第六章4-缺第七题(已下线)【万唯原创】2014年陕西-面对面正文-第一部分 教材知识梳理23(已下线)【万唯原创】2014年陕西-试题研究-第1部分.考点研究402020年陕西省中考数学一模试题
名校
7 . 如图,在正方形
中,
是对角线
上的一点,点
在
的延长线上,连接
、
、
,延长
交
于点
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
,
,则下列结论:①
;②
;③
;④
,其中正确的结论序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/d1a4ac16-face-41f4-b4c6-520d2942a6fd.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b01e4f8cfd691beb72d0d35a0b882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f25e17274203646a6007401c25088b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5664c4313feffc0de86b434adb0d3bca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/d1a4ac16-face-41f4-b4c6-520d2942a6fd.png?resizew=192)
A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
您最近一年使用:0次
8 . 在△ABC中,AB=4,∠C=60°,∠A≠∠B,则BC的长的取值范围是_____ .
您最近一年使用:0次
9 . 在
中,
,以直角边
为直径作
,交
于点
,
为
的中点,连接
、
.
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436557754466304/2437112735055872/STEM/9ae28022-34b5-4ff2-99f3-7b2b2286310c.png)
(1)求证:
为
切线.
(2)若
,填空:
①当
________时,四边形
为正方形;
②当
________时,
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436557754466304/2437112735055872/STEM/9ae28022-34b5-4ff2-99f3-7b2b2286310c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51d3d46e04a1c44e6393916a57d94a4.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0574e32fad19571c0a9c9fcf839094ba.png)
您最近一年使用:0次
2020-04-08更新
|
261次组卷
|
3卷引用:河南省信阳市2019-2020学年九年级下学期3月月考数学试题
解题方法
10 . 问题情景:数学课上,老师布置了这样一道题目,如图1,△ABC是等边三角形,点D是BC的中点,且满足∠ADE=60°,DE交等边三角形外角平分线于点E.试探究AD与DE的数量关系.
操作发现:(1)小明同学过点D作DF∥AC交AB于F,通过构造全等三角形经过推理论证就可以解决问题,请您按照小明同学的方法确定AD与DE的数量关系,并进行证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/7d2880af-a210-4ada-94a7-af2aa77c8885.png?resizew=166)
类比探究:(2)如图2,当点D是线段BC上任意一点(除B、C外),其他条件不变,试猜想AD与DE之间的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/07d21ffd-d736-4652-9fdb-a6bd195afffb.png?resizew=173)
拓展应用:(3)当点D在线段BC的延长线上,且满足CD=BC,在图3中补全图形,直接判断△ADE的形状(不要求证明).
操作发现:(1)小明同学过点D作DF∥AC交AB于F,通过构造全等三角形经过推理论证就可以解决问题,请您按照小明同学的方法确定AD与DE的数量关系,并进行证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/7d2880af-a210-4ada-94a7-af2aa77c8885.png?resizew=166)
类比探究:(2)如图2,当点D是线段BC上任意一点(除B、C外),其他条件不变,试猜想AD与DE之间的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/07d21ffd-d736-4652-9fdb-a6bd195afffb.png?resizew=173)
拓展应用:(3)当点D在线段BC的延长线上,且满足CD=BC,在图3中补全图形,直接判断△ADE的形状(不要求证明).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/d6dcedeb-1c8f-4407-afc1-30650a4f3635.png?resizew=272)
您最近一年使用:0次