1 . 完成下列证明:
已知
,
,垂足分别为D、F,且
,求证
.
,
(已知),
∴
( )
∴
( )
∴
( )
又∵
( )
∴
(等量代换)
∴
( )
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b97b584811922d18b678a679c7da19.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
您最近一年使用:0次
2 . 如图,已知
,
,求证:
.请将下面证明过程补充完整.
(已知)
∴
(____________).
又∵
(已知)
∴____________(同角的补角相等).
∴
(____________).
∴
(____________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5048da25cfba78c683d4dec68f0771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff048fcb7321f68dac61d679d4314992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a11be1dce47ca9df1e6999b55c4917.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e20360cd68f0e77a3f0ca955a547be9.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
∴____________(同角的补角相等).
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11746407732cc6c2332a6ef126e9f952.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff048fcb7321f68dac61d679d4314992.png)
您最近一年使用:0次
2024-05-16更新
|
45次组卷
|
2卷引用:福建省三明市尤溪县2023-2024学年七年级下学期期中数学试题
3 . 如图,
,
.求证:
.
(已知),
(________________________).
(__________________).
(已知),
(________________________).
______(两直线平行,内错角相等).
,
____________,
(等量代换).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66f3f3d1796ddf5b02469d13f1b4a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d93d1a5af01fe4172a8a35eb5dd0656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c822ef5bdec53710dd193f8a9e3675ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6897cb88451fb6be292131f558c2f994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da667095c5dc2d1d5f93d3d6821e20b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145777aca077369f9ea1fc20cdc06350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d264a24f3320892f3690aab0c778e1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb6cb440e03a5982e3d59e1cda8e941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf919bfc4e3b2f1e022509c944cc675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4573728217b67b1b09ddc87ba4ca41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ef0347b083bb3e9bebd969f49e459f.png)
您最近一年使用:0次
名校
4 . 如图,
,
的平分线交
于点F,交线段
的延长线于点E,
.
求证:
.
请将下面证明过程和推理依据补充完整:
证明:∵
,
∴
(___①___)
∵
平分
,
∴
(角平分线的定义)
∴
.(等量代换)
∵
,
∴
___②___.(等量代换)
∴
.(___③___)
∴
.(___④___)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e180ad42e0a5044c6e463556b4155a.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efaf7b390077d8c7d0540bac6ddee37d.png)
请将下面证明过程和推理依据补充完整:
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91f72251d43a5c03587f93ae284e3af.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/fbc8c4f6e8d4d21439ee0f7f3a64e77c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb18cfb53c5b4fa6b7a5a1c3213a21.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e180ad42e0a5044c6e463556b4155a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13abe7d86f8abedd910ddd0f6fdf811.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efaf7b390077d8c7d0540bac6ddee37d.png)
您最近一年使用:0次
2024-05-06更新
|
80次组卷
|
3卷引用:福建省福州市连江县2023-2024学年七年级下学期期中数学试题
名校
5 . 在
中,
,
,点D是平面上的一点,
,将线段AD绕D点顺时针旋转90°,得到线段DE,连接BE.
;
(2)如图2,当点C,E,D三点共线时,且
,求
的值;
(3)如图3,当点D落在线段AB下方时,作BE中点M,连接CM,DM,猜想
的形状,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8178a430ab04499222bae632c257f49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ef747dfdeb036aad26aa9657dc4ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b20cbbe14eec779005ba4437a9e669.png)
(2)如图2,当点C,E,D三点共线时,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24863a52a4148b7f0bbc7732b9235cd.png)
(3)如图3,当点D落在线段AB下方时,作BE中点M,连接CM,DM,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
您最近一年使用:0次
6 . 在下面的证明过程中,请在括号内填上推理的根据.
如图,
,
,点
是
延长线上一点,若
,求证:
.
(已知)
( )
(已知)
(等量代换)
( )
( )
(已知)
(等量代换)
∴
( )
(已知)
( ).
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19500671300295a9c49eced6900b4c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6706c88443ead35c76bcf2f3ec24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b99dbc4e1e162bdce68a31cc7900ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba51168da9382b9e573fcc4a88b6268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9d6ab21bdbeb5985aea9dc4c9eb4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8477e01fb401f83a40ab2a98fbf599f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860cdda80c1bdfdef18c0329050fa446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ff8c9803cee13b78543b885a53d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09fe99bea572035fc77a40e7654046f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b221e2bdd01220a8942e91fd50652b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6706c88443ead35c76bcf2f3ec24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3554cda86015e7f87ff65a442547459.png)
您最近一年使用:0次
11-12七年级下·江苏盐城·期中
名校
7 . 如图,直线
,连接
,直线
、
及线段
把平面分成①、②、③、④四个部分,规定:线上各点不属于任何部分.当动点
落在某个部分时,连接
,
,构成
,
,
三个角.(提示:有公共端点的两条重合的射线所组成的角是
角)
落在第①部分时,求证:
;
(2)当动点
落在第②部分时,
是否成立?如果成立,请说明理由;不成立直接写出结论.
(3)当动点
落在第③部分时,全面探究
,
,
之间的关系,并写出动点
的具体位置和相应的结论.选择其中一种结论加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd77ccdd91fbd630254938b3502d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32986401a4d24904d5e446fa9210ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98f2e85bdf9c6669c14f8966ed53be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c2b49db6c406fb02ec6c6e84d08ab1.png)
(2)当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c2b49db6c406fb02ec6c6e84d08ab1.png)
(3)当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32986401a4d24904d5e446fa9210ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98f2e85bdf9c6669c14f8966ed53be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2024-04-26更新
|
173次组卷
|
21卷引用:福建省龙岩市漳平市2017-2018学年七年级下学期期中数学试题
福建省龙岩市漳平市2017-2018学年七年级下学期期中数学试题福建省龙岩市紫金山实验学校2021-2022学年七年级下学期第一次月考数学试题(已下线)2011-2012学年江苏东台市新曹农场中学七年级下学期期中考试数学卷(已下线)2012-2013学年浙江临安於潜第一初级中学八年级10月数学试卷2013学年江苏省南京市溧水县孔镇中学七年级下学期学情调研数学试卷2014-2015学年浙江省台州八校七年级下学期期中联考数学试卷2015-2016学年安徽省宿州市闵贤中学八年级上第一次月考数学A卷江苏省徐州市丰县创新外国语学校2017-2018学年七年级下学期第一次月考数学试题江苏省丹阳市云阳中学2018-2019学年七年级下学期第一次月考数学试题沪教版(上海)七年级第五章 第二期 平行线与相交线(2)陕西省汉中市宁强县2018-2019学年上学期七年级期末数学试题(已下线)【新东方】 初中数学20210622-088【初一下】(已下线)上海七年级下学期期中精选50题(压轴版)-2021-2022学年七年级数学下学期考试满分全攻略(沪教版)黑龙江省佳木斯市桦南县第四中学2021-2022学年七年级下学期第一次质量监测数学试题湖南省长沙市浏阳市2021-2022学年七年级下学期期中数学试题(已下线)江苏省泰州市姜堰区第四中学2022-2023学年七年级下学期数学独立作业3.2(已下线)核心考点03 三角形有关概念与性质-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(沪教版)辽宁省鞍山市岫岩满族自治县2023-2024学年七年级下学期4月月考数学试题湖北省潜江市初中联考协作体2023-2024学年七年级下学期月考数学试题辽宁省鞍山市海城市第六中学2023-2024年七年级下学期第一次月考数学试题(已下线)上海市七下期中真题精选(压轴大题50题7个考点分类专练)-2023-2024学年七年级数学下学期期中考点大串讲(沪教版)
8 . 补全下面括号内容,完成下面的证明.
如图,E、F分别在
,
上,
,
与
互余,
于点G,求证:
.
(已知),
∴
(_________________) ,
∵
(已知),
∴
,(同位角相等,两直线平行),
∴
(________________),
又∵
(已知),
∵
,
∴
,
∴
(_______________________),
∴
(________________________).
如图,E、F分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa4e9eebe76c572fbac1522085868b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beccb2dcf2bcc13f5494f1e3c27bcf3f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa4e9eebe76c572fbac1522085868b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8781208b8fe41342b9bd8b20456cdba.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cdcf3b2965480eb57318ccd34e14dc2.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43724e211344fed172ba099a9703912.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f071a08352752b2b33b8ff17d06e9071.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac60b47cfe79180029880869c60f8d32.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6080f91798816e56990a89d2f91c091a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
您最近一年使用:0次
9 . 如图,四边形
为正方形,点E为
上的定点,点F是射线
上的动点,连接
.将点F绕点A逆时针旋转
得到点H,连接
,过点
分别作
和
的垂线交于点G,射线
与射线
交于点P.
为正方形;
(2)点F在运动过程中,判断点P的位置是否发生变化?并说明理由;
(3)连接
,探究线段
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449870555f4df74edd28dc83f0383f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e27d700becd7569ab631bc3113646a.png)
(2)点F在运动过程中,判断点P的位置是否发生变化?并说明理由;
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6b3fa8c69a596136072482f756026a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e688fe1ef5e387cf3192d410744f91.png)
您最近一年使用:0次
2024-04-16更新
|
124次组卷
|
2卷引用:福建省莆田市城厢区第三中学2023-2024学年九年级下学期月考数学试题
10 . 完成下面的证明,
如图,
,
.求证:
.
(已知),
______
(________________________)
(已知),
______.
(________________________).
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b118c1f12ed7c86ec32491c3ab5b5a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7301aabd9b7d81ff135f40b81ada46d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/359c458aa6e62f768ab2fe49b20e6c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf5667c612604ce94f1263fe03a9d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e63e862820b30b27f687008a2dc47da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78163b1e78c917f86dc961a038329ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc6290efdeed575038c89af35537867.png)
您最近一年使用:0次