按逻辑填写步骤和理由,将下面的证明过程补充完整
如图,直线MN分别与直线AC、DG交于点B、F,且∠1=∠2.∠ABF的角平分线BE交直线DG于点E,∠BFG的角平分线FC交直线AC于点C.
求证:
.
∠ABF=∠1(对顶角相等)
∠BFG=∠2(____________)
∴∠ABF=______(等量代换)
∵BE平分∠ABF(已知)
∴
______(____________)
∵FC平分∠BFG(已知)
∴
______(____________)
∴∠EBF=______
∴
(____________)
如图,直线MN分别与直线AC、DG交于点B、F,且∠1=∠2.∠ABF的角平分线BE交直线DG于点E,∠BFG的角平分线FC交直线AC于点C.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee4efe3a7e48a8ea0059228947b8f9.png)
∠ABF=∠1(对顶角相等)
∠BFG=∠2(____________)
∴∠ABF=______(等量代换)
∵BE平分∠ABF(已知)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ada00c878942eecb2d326d48f074c8.png)
∵FC平分∠BFG(已知)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2268b13d38e3b6c87e37a5109edc531.png)
∴∠EBF=______
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee4efe3a7e48a8ea0059228947b8f9.png)
21-22七年级下·辽宁沈阳·期末 查看更多[9]
辽宁省沈阳市皇姑区2021-2022学年七年级下学期期末数学试题(已下线)专题5.33 相交线与平行线(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(人教版)(已下线)第7章 平面图形的认识(二) 章末检测卷-2022-2023学年七年级数学下册重难题型全归纳及技巧提升专项精练(苏科版)(已下线)第五章 相交线与平行线 章末检测卷-2022-2023学年七年级数学下册重难题型全归纳及技巧提升专项精练(人教版)(已下线)专题10.34 相交线、平行线与平移(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(沪科版)黑龙江省绥化市绥棱县克音河学校2022-2023学年(五四学制)八年级下学期期中数学试题山西省大同市云州区大同市大成双语学校2023-2024学年七年级下学期月考数学试题山西省朔州市右玉县教育集团初中部月考考试2023-2024学年七年级下学期月考数学试题(已下线)第01讲 探索直线平行的条件(3大考点+7种题型+强化训练)-【帮课堂】2023-2024学年七年级数学下册同步学与练(苏科版)
更新时间:2022-08-30 13:44:40
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适中
(0.65)
【推荐1】如图,
,
、
分别为直线
、
上两点,且
,若射线
绕点
顺时针旋转至
后立即回转,射线
绕点
逆时针旋转至
后立即回转,两射线分别绕点
、点
不停地旋转,若射线
转动的速度是
秒,射线
转动的速度是1°/秒.
顺时针旋转______秒,射线
第一次成为
的角平分线;
(2)若射线
、射线
同时旋转
秒,此时射线
、射线
有怎样的位置关系?请说明理由.
(3)若射线
绕点
顺时针先转动15秒,射线
才开始绕点
逆时针旋转,在射线
到达
之前,问射线
再转动______秒时,射线
、射线
互相平行.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7928198bde37727e3a04a7f3e6b306fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(2)若射线
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(3)若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,两条笔直的街道AB,CD相交于点O,街道OE,OF分别平分∠AOC,∠BOD,比较∠1与∠2的关系,并说明街道EOF是笔直的.
![](https://img.xkw.com/dksih/QBM/2019/1/30/2129848637702144/2132863273320448/STEM/140327d0fdbf43bdb15aa1498b60ac49.png?resizew=125)
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解答题-作图题
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适中
(0.65)
【推荐3】已知:如图,直线
与
分别相交于点E,F.
,
,
和
的位置关系为________;
(2)在(1)的情兄下,若点P是平面内的一个动点,连接
,探索
三个角之间的关系;
①当点P在图2的位置时,可得
;
请阅读下面的解答过程,并填空(理由或数学式):
解:如图2、过点P作
,
则
(________).
∵
(已知),
(作图),
∴
(________).
∴
.
∴
( ).
即
;
②当点P在图3的位置时,求
三个角之间有何数量关系;
③当点P在图4的位置时,请![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c470aaacdedff0a598430d96979d5416.png)
三个角之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)的情兄下,若点P是平面内的一个动点,连接
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
①当点P在图2的位置时,可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
请阅读下面的解答过程,并填空(理由或数学式):
解:如图2、过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8127ea8d23aa084f18ebee511a063f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7475ed82abed407ad2ff74cf3f59600.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743229db6c9a9a0bbf7d242ffdbd41ef.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe50f7b70d0c03d8b62aeab8582544f.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
②当点P在图3的位置时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
③当点P在图4的位置时,请
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c470aaacdedff0a598430d96979d5416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,直线
分别与直线
和
交于点
,
,且满足
.
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(1)试判断直线
与
的位置关系,并说明理由.
(2)作
的平分线
交
于点
,过点
作
交
于点
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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(1)试判断直线
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(2)作
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb1de78a83c3a206ed3a3949e313f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265409a96768a912091b43a9c9d56045.png)
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解答题
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(0.65)
【推荐2】如图,
平分
,
.
(1)求证:
//
;
(2)若
,
,求
的度数(用含
的代数式表示).
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc5ea9810b67acbc7e9006fb6f8316f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
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