1 . 【问题情境】
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/39598fc2-ae43-4538-be61-6743a568c228.png?resizew=506)
利用角平分线构造全等三角形是常用的方法,如图1,OP平分
.点A为OM上一点,过点A作
,垂足为C,延长AC交ON于点B,可根据ASA证明
,则
,
(即点C为AB的中点).
【问题探究】
如图2,
中,
,
,CD平分
,
,垂足E在CD的延长线上,试探究BE和CD的数量关系,并证明你的结论:
【拓展延伸】
如图3,
中,
,
,点D在线段BC上,且
,
于E,DE交AB于F,试探究BE和DF之间的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/39598fc2-ae43-4538-be61-6743a568c228.png?resizew=506)
利用角平分线构造全等三角形是常用的方法,如图1,OP平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a2fe360dbaf805c6b8bff7b07c1dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febeafb130cbafbed0e6ce3599199ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
【问题探究】
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
【拓展延伸】
如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f4539785f39a7d09edc3261185850a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.png)
您最近一年使用:0次
2022-07-11更新
|
226次组卷
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4卷引用:内蒙古自治区鄂尔多斯市准格尔旗2021-2022学年八年级上学期期末数学试题
内蒙古自治区鄂尔多斯市准格尔旗2021-2022学年八年级上学期期末数学试题(已下线)专题1.60 《三角形的初步知识》全章复习与巩固(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)河南省漯河市临颍县2022-2023学年八年级上学期期中数学试题河南省周口市扶沟县2023-2024学年八年级上学期期中数学试题
2 . 观察猜想:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8bfbddf6-b0ad-410d-942a-434f5d5db663.png?resizew=444)
(1)如图1,
,
,D,C,E三点在同一条直线上,且
,
,垂足分别为点D,E,则线段
,
,
三者之间的数量关系是_____________;
类比探究:
(2)如图2,
,
,D,C,E三点在同一条直线上,且
,
,垂足分别为D,E,线段
,
,
三者之间的数量关系有变化吗?请说明理由.
拓展延伸:
(3)如图3,若将(1)中的条件改为:在
中,
,D,C,E三点在同一条直线上,并且有
,
为任意钝角,那么(1)中你的结论是否还成立?若成立,请证明;若不成立,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8bfbddf6-b0ad-410d-942a-434f5d5db663.png?resizew=444)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
类比探究:
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
拓展延伸:
(3)如图3,若将(1)中的条件改为:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c94aef295ea87cbead77eb7697f1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2022-07-26更新
|
164次组卷
|
2卷引用:内蒙古自治区赤峰市克什克腾旗2022-2023学年八年级上学期期末数学试题
3 . (1)操作思考:如图1,在平面直角坐标系中,等腰
的直角顶点C在原点,若顶点A恰好落在点
处,则点B的坐标为 ;
(2)感悟应用:如图2,一次函数
的图象与y轴交于点A,与x轴交于点B,过点B作线段
且
,直线
交x轴于点D.
①点A的坐标为 ,点B的坐标为 ;
②直接写出点C的坐标 ;
(3)拓展研究:如图3,在平面直角坐标系中,
的顶点A、C分别在y轴、x轴上,且
,
.若点C的坐标为
,点A的坐标为
,点B在第四象限时,请求出点B的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
(2)感悟应用:如图2,一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9427de5d22d37859a110dbb234313c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714a0ac0365c969671651ad68c7076f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e644d4089ff0987b982265cd8bb4e36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
①点A的坐标为 ,点B的坐标为 ;
②直接写出点C的坐标 ;
(3)拓展研究:如图3,在平面直角坐标系中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e7c8586eef5596aef5fb5160a196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c287bb15494297df234f700f9f3a90d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
您最近一年使用:0次
2023-11-15更新
|
178次组卷
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8卷引用:内蒙古自治区包头市青山区2023-2024学年八年级上学期期中数学试题
内蒙古自治区包头市青山区2023-2024学年八年级上学期期中数学试题湖南省岳阳市岳阳县2022-2023学年八年级下学期期末数学试题湖南省岳阳市岳阳县2022--2023学年八年级上学期期末数学试题山东省烟台市莱州市2023-2024学年七年级上学期1月期末数学试题 陕西省宝鸡市凤翔区2023-2024学年八年级下学期期中数学试题陕西省咸阳市泾阳县2023-2024学年八年级下学期试题数学试题(已下线)期末真题必刷03(常考60题26个考点专练)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)四川省达州市达川四中联盟2023-2024学年七年级下学期期中考试数学试题
4 . 问题提出:
(1)我们把两个面积相等但不全等的三角形叫做偏等积三角形,如图
中,
,
,
,
为
上一点,当
________时,
与
是偏等积三角形;
问题探究:
(2)如图,
与
是偏等积三角形,
,
,且线段
的长度为正整数,过点
作
交
的延长线于点
,求
的长度为________.
问题解决:
(3)如图,四边形
是一片绿色花园,
,
,
(
).
与
是偏等积三角形吗?请说明理由.
(1)我们把两个面积相等但不全等的三角形叫做偏等积三角形,如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403d74859e7b8b4cebf40add6e92b0f8.png)
问题探究:
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
问题解决:
(3)如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae698d7fbcebf627940dc8a4f992d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/b85cc3b5-ebd7-4cab-99d0-fe99d70f8a10.png?resizew=472)
您最近一年使用:0次
5 . 如图1,已知在等腰直角
中,
,
,
,
是
的中点,点
从A点出发,以
的速度沿着射线
方向运动,连接
交
于点
,过点
作
的垂线交直线
于点
,交直线
于点
,若运动时间为
.
(1)当
时,求
的长;
(2)在点
的运动过程中,试探究线段
与
的数量关系,并说明理由;
(3)如图2,连接
,
上是否存在点
使得
与
全等,若存在,求出此时
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2b024e5926973d8e69d466b9c0e94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/d3f1363c-44df-4275-97c5-09c7e684f5e4.png?resizew=348)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2ba7dd2f5b1f162a07c990e280c423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade3c0268fac116f7e2a1e5fe5a25739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2023-11-15更新
|
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3卷引用:内蒙古自治区呼和浩特市第八中学2023-2024学年八年级上学期期中数学试题
内蒙古自治区呼和浩特市第八中学2023-2024学年八年级上学期期中数学试题江西省高安市2023-2024学年八年级上学期期中数学试题(已下线)猜题02 轴对称图形(易错 拔尖必刷64题17种题型专项训练)-2023-2024学年八年级数学上学期期末考点大串讲(苏科版)
6 . 同学们还记得教科书中的这个问题吗?如图(1),四边形
是正方形,点
是边
的中点,
,且
交正方形外角
的平分线
于点
.求证:
.书中的提示是:取
的中点G,连接
,这样易证
后得到
.在此基础上,请同学们探究以下问题:
上(除点B,C外)的任意一点,其它条件不变,
的结论还成立吗?如果成立,写出证明过程;如果不成立,请说明理由;
(2)如图(3),点E是
的延长线上(除点C外)的任意一点,其他条件不变,
的结论仍然成立吗?如果成立,写出证明过程;如果不成立,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7a82bf203df79ba6c0ef80026198d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d6220182da1bb5fb86b6b98c95fd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(2)如图(3),点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
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2024-04-16更新
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372次组卷
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5卷引用:内蒙古自治区巴彦淖尔市杭锦后旗2023-2024学年八年级下学期4月期中考试数学试题
内蒙古自治区巴彦淖尔市杭锦后旗2023-2024学年八年级下学期4月期中考试数学试题内蒙古自治区巴彦淖尔市杭锦后旗杭锦后旗第六中学2023-2024学年八年级下学期期中数学试题四川省泸州市江阳区2022-2023学年八年级下学期期末数学试题山东省日照市岚山区2023-2024学年八年级下学期期中数学试题(已下线)考题猜想3-5平行四边形(常考四种题型,特殊平行四边形性质和判定的综合应用)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)
7 . 阅读理解,自主探究:
(1)如图
,在
中,
,
,直线
经过点
,且
于点
,
于点
.求证
.
(2)当直线
绕点
旋转到图
的位置时,其余条件不变,你认为上述结论是否成立?若成立,写出证明过程;若不成立,请写出此时
、
、
之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/57d1f6dd-e81e-4614-86c0-75a2370b99e5.png?resizew=318)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7920d2550a6af7df3db60a33fe02c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d9b83f3c224fc8e10a46ab71530c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89dc287e73e249f4c807420b826624ae.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
8 . 如图,在
中,
平分
交
于点
,
平分
交
于点
,
与
交于点
,
.
(1)求
的度数;
(2)过点
作
于点
,探究
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/312753da-1bee-4121-9174-67295e932397.png?resizew=129)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
9 . 如图,
中,
,AD=AE=3,点B在
内,且
,将AB绕点A逆时针旋转90°得到AC,连接CB,CD,BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/2aeadf39-5ae8-49f2-899e-b035775900de.png?resizew=187)
(1)试探究BE与DC的关系;
(2)当
时,连接BD,求出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/2aeadf39-5ae8-49f2-899e-b035775900de.png?resizew=187)
(1)试探究BE与DC的关系;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4aa006f1472ef6d13df527ebad5cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
您最近一年使用:0次
10 . (1)如图①,在四边形
中,
,E是
的中点,
是
的平分线,则线段
之间的等量关系为 ;
(2)问题探究:如图②,在四边形
中,
,
与
的延长线交于点F,E是
的中点,
是
的平分线,试探究线段
之间的等量关系,并证明你的结论;
(3)如图③,在四边形
中,
是
的平分线,E是
的中点,
,
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2892af2a890aca2c02d38a25a4aa6f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ff8aa4a57835a91bb479ab211dcc46.png)
(2)问题探究:如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06a69053cd401da800fb24fba94d4d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70634475dd6297605da3e450494847dd.png)
(3)如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2892af2a890aca2c02d38a25a4aa6f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ed9f2013acf1249b733a3f6c002a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9214950657738de5dbaf2fe2de024fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17b35ab404be024d1e186f9d8e37e3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/a6690091-ce94-49cf-b3da-4aa377959c1b.png?resizew=446)
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