定义:从一个角的顶点出发把这个角分成
的两个角的射线叫做这个角的一条三等分线.例如,如图①,
,则
是
的一条三等分线.显然,一个角的三等分线有两条.
(1)如图②,已知
,
、
是
的两条三等分线,则
的度数为 ;
(2)在(1)的条件下,若以点
为旋转中心将射线
顺时针旋转
得到射线
.
①当
恰好为
的三等分线时,求
的值;
②在旋转过程中,若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cf7633fe1cf4a393c17d56d8683dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/cd750eab-ef44-43f1-aec8-519001a72762.png?resizew=320)
(1)如图②,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6dd249c03feba4343809280690343fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
(2)在(1)的条件下,若以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30902e43bf1f7aac8a12e7beb5ad14a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142e0f0e25dc2ad81ec1a7ec6ed866b.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a37f16fb409264dbd6e7b3a425c805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
②在旋转过程中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05d7e8f98a4e6eba11636a2a86e6f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
21-22七年级上·江苏苏州·期末 查看更多[9]
江苏省苏州市姑苏区金阊实验中学校2021-2022学年七年级上学期期末数学试题(已下线)专题4.23 角的n等分线模型(分层练习)-2023-2024学年七年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题4.24 角的n等分线模型(分层练习)(综合练)-2023-2024学年七年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题6.27 角的n等分线模型(分层练习)(综合练)-2023-2024学年七年级数学上册基础知识专项突破讲与练(苏科版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(人教版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(北师大版)(已下线)专题6.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(苏科版)(已下线)专题6.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(浙教版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(沪科版)
更新时间:2023-02-01 19:04:44
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解答题-问答题
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【推荐1】如图
,大课间的广播操展让我们充分体会到了一种整体的图形之美,洋洋和乐乐想从数学角度分析下如何能让班级同学们的广播操做得更好,他们搜集了标准广播操图片进行讨论,如图
,为了方便研究,定义两手手心位置分别为
,
两点,两脚脚跟位置分别为
,
两点,定义
,
,
,
平面内
为定点,将手脚运动看作绕点
进行旋转:
(1)填空:如图
,
,
,
三点共线,且
,则
______°;
(2)第三节腿部运动中,如图
,洋洋发现,虽然
,
,
三点共线,却不在水平方向上,且
,他经过计算发现,
的值为定值,请判断洋洋的发现是否正确,如果正确请求出这个定值,如果不正确,请说明理由;
(3)第四节体侧运动中,乐乐发现,两腿左右等距张开且
,开始运动前
、
、
三点在同一水平线上,
、
绕点
顺时针旋转,
旋转速度为
,
旋转速度为
,当
旋转到与
重合时,运动停止,如图
.
运动停止时,直接写出
______;
请帮助乐乐求解运动过程中
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/1676f9a3-e0db-42db-a3ff-d323d7345919.png?resizew=440)
(1)填空:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f18cef1745d84a0265246684753bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
(2)第三节腿部运动中,如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edfa9400b67ebd6022e4bbcd59d19345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df9313be8608aeafa92542931e74545f.png)
(3)第四节体侧运动中,乐乐发现,两腿左右等距张开且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a327b3c7ec05a5da39530fd3b34379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445471c0dcabd97e84956a0836a4f790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66af14e8febe687b757b587c4bdb27f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
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【推荐2】问题:已知线段AB∥CD,在AB、CD间取一点P(点P不在直线AC上),连接PA、PC,试探索∠APC与∠A、∠C之间的关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/208050bc-7908-4c19-b22b-98bbec523221.png?resizew=488)
(1)端点A、C同向:
如图1,点P在直线AC右侧时,∠APC﹣(∠A+∠C)= 度;
如图2,点P在直线AC左侧时,∠APC+(∠A+∠C)= 度;
(2)端点A、C反向:
如图3,点P在直线AC右侧时,∠APC与∠A﹣∠C有怎样的等量关系?写出结论并证明;
如图4,点P在直线AC左侧时,∠APC﹣(∠A﹣∠C)= 度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/208050bc-7908-4c19-b22b-98bbec523221.png?resizew=488)
(1)端点A、C同向:
如图1,点P在直线AC右侧时,∠APC﹣(∠A+∠C)= 度;
如图2,点P在直线AC左侧时,∠APC+(∠A+∠C)= 度;
(2)端点A、C反向:
如图3,点P在直线AC右侧时,∠APC与∠A﹣∠C有怎样的等量关系?写出结论并证明;
如图4,点P在直线AC左侧时,∠APC﹣(∠A﹣∠C)= 度.
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【推荐1】已知如图1,∠AOB=40°
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/836c6af6-7a0a-42ed-98cc-cac3c7de2006.png?resizew=409)
(1)若∠AOC=
∠BOC,则∠BOC= ;
(2)如图2,∠AOC=20°,OM为∠AOB内部的一条射线,ON是∠MOC四等分线,且3∠CON=∠NOM,求4∠AON+∠COM的值;
(3)如图3,∠AOC=20°,射线OM绕着O点从OB开始以5度/秒的速度逆时针旋转一周至OB结束,在旋转过程中,设运动的时间为t,ON是∠MOC四等分线,且3∠CON=∠NOM,当t在某个范围内4∠AON+∠BOM会为定值,请直接写出定值,并指出对应t的范围(本题中的角均为大于0°且小于180°的角).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/836c6af6-7a0a-42ed-98cc-cac3c7de2006.png?resizew=409)
(1)若∠AOC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(2)如图2,∠AOC=20°,OM为∠AOB内部的一条射线,ON是∠MOC四等分线,且3∠CON=∠NOM,求4∠AON+∠COM的值;
(3)如图3,∠AOC=20°,射线OM绕着O点从OB开始以5度/秒的速度逆时针旋转一周至OB结束,在旋转过程中,设运动的时间为t,ON是∠MOC四等分线,且3∠CON=∠NOM,当t在某个范围内4∠AON+∠BOM会为定值,请直接写出定值,并指出对应t的范围(本题中的角均为大于0°且小于180°的角).
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名校
【推荐2】【问题背景】
(1)如图1的图形我们把它称为“8字形”,请说明
;
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/ff315f31e5b84878b856d967bd4710e9.png?resizew=158)
【简单应用】
(2)阅读下面的内容,并解决后面的问题:如图2, AP、CP分别平分∠BAD. ∠BCD,若∠ABC=36°,∠ADC=16°,求∠P的度数;
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/3f211921bec4460c83c1f40463d0bea5.png?resizew=228)
解:∵AP、CP分别平分∠BAD. ∠BCD
∴∠1=∠2,∠3=∠4
由(1)的结论得:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c700d5e2382f9576860426ece638fcb.png)
①+②,得2∠P+∠2+∠3=∠1+∠4+∠B+∠D
∴∠P =
(∠B+∠D)=26°.
【问题探究】如图3,直线AP平分∠BAD的外角∠FAD,CP平分∠BCD的外角∠BCE,若∠ABC=36°,∠ADC=16°,请猜想
的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/1ba81aa5f46f48a7bc9aca39dc84e740.png?resizew=219)
【拓展延伸】
① 在图4中,若设∠C=α,∠B=β,∠CAP=
∠CAB,∠CDP=
∠CDB,试问∠P与∠C、∠B之间的数量关系为:________________(用α、β表示∠P),
②在图5中,AP平分∠BAD,CP平分∠BCD的外角∠BCE,猜想∠P与∠B、∠D的关系,直接写出结论______________________
(1)如图1的图形我们把它称为“8字形”,请说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6436b9c2493203d008064460c3c487.png)
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/ff315f31e5b84878b856d967bd4710e9.png?resizew=158)
【简单应用】
(2)阅读下面的内容,并解决后面的问题:如图2, AP、CP分别平分∠BAD. ∠BCD,若∠ABC=36°,∠ADC=16°,求∠P的度数;
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/3f211921bec4460c83c1f40463d0bea5.png?resizew=228)
解:∵AP、CP分别平分∠BAD. ∠BCD
∴∠1=∠2,∠3=∠4
由(1)的结论得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c700d5e2382f9576860426ece638fcb.png)
①+②,得2∠P+∠2+∠3=∠1+∠4+∠B+∠D
∴∠P =
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
【问题探究】如图3,直线AP平分∠BAD的外角∠FAD,CP平分∠BCD的外角∠BCE,若∠ABC=36°,∠ADC=16°,请猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/1ba81aa5f46f48a7bc9aca39dc84e740.png?resizew=219)
【拓展延伸】
① 在图4中,若设∠C=α,∠B=β,∠CAP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/4583a1c163ee445d803df52c372a22e8.png?resizew=210)
②在图5中,AP平分∠BAD,CP平分∠BCD的外角∠BCE,猜想∠P与∠B、∠D的关系,直接写出结论______________________
![](https://img.xkw.com/dksih/QBM/2017/3/20/1647755697938432/1653054871166976/STEM/1c69a2c30f1344d9af03a57e3d0b62f9.png?resizew=202)
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【推荐3】(1)如图1,点
在线段
上,图中共有3条线段:
和
,若其中有一条线段的长度是另一条线段长度的两倍,则称点
是线段
的“二倍点”.则线段
上共有____________个“二倍点”.
(2)类似的如图1,射线
在
内部,图中共有3个角:
和
,若其中一个角的度数是另一个角度数的两倍,则称射线
是
的“二倍线”.则
内部共有_____________条“二倍线”.
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/24d64bdbe1484c37abb7349b94598a60.png?resizew=554)
(3)如图2,若线段
,点
从点
的位置开始,以每秒
的速度向点
运动,当点
到达点
时停止运动,设
运动的时间为
秒.问
为何值时,点
是线段
的“二倍点”.
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/9cb7161f58324f9eb4c01138795a3295.png?resizew=259)
(4)如图3,若
,射线
从射线
的位置开始,绕点
按逆时针方向以每秒5°的速度向射线
旋转,当射线
到达射线
的位置时停止旋转,设射线
旋转的时间为
秒,若射线
是
的“二倍线”,求
的值.
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/6fd6e81c698249c2b9bd62a78b6be684.png?resizew=273)
(5)在(4)的条件下,同时射线
从射线
的位置开始,绕点
按顺时针方向以每秒10°的速度向射线
旋转,当射线
到达射线
的位置时停止旋转,同时射线
也停止旋转.请直接写出当射线
是
的“二倍线”时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)类似的如图1,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f513a6d495de9ce93f80d21995eff470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/24d64bdbe1484c37abb7349b94598a60.png?resizew=554)
(3)如图2,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e5a54cc55362d7a779d2e90216a960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/9cb7161f58324f9eb4c01138795a3295.png?resizew=259)
(4)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e847513a54d0e5a8433f583767ccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651547542937600/2684078461288448/STEM/6fd6e81c698249c2b9bd62a78b6be684.png?resizew=273)
(5)在(4)的条件下,同时射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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