在数学实践活动课上,“卓越”小组准备研究如下问题:如图,
为直尺的一条边,四边形
为一正方形纸板(
、
、
、
均为直角)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/670ec1b9-78dd-47d2-b269-c144bb8e2ea5.png?resizew=552)
(1)【操作发现】
如图①小组成员小方把正方形的一条边
与
重合放置,刘老师在与同学们交流研讨时又做出了
的平分线
,交正方形的边于点
.则此时
的度数为______ ;
与
的度数之间的关系为______ .
(2)【问题探究】
受小方同学的启发,小组成员小丽将正方形纸板按如图②放置,若此时记
的度数为
,其他条件不变,请帮小丽同学探究:
与
的度数之间的关系是否发生改变,并说明理由.
(3)【拓展延伸】
组内其他同学也都继续探索,将正方形按如图③放置,刘老师同样做出了
的平分线
,请直接写出
与
的度数之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/670ec1b9-78dd-47d2-b269-c144bb8e2ea5.png?resizew=552)
(1)【操作发现】
如图①小组成员小方把正方形的一条边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c36ff76f9f1ee12db562cde7a58b8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)【问题探究】
受小方同学的启发,小组成员小丽将正方形纸板按如图②放置,若此时记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(3)【拓展延伸】
组内其他同学也都继续探索,将正方形按如图③放置,刘老师同样做出了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c36ff76f9f1ee12db562cde7a58b8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed869cf090d990decfef8c57b8ce6d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
22-23七年级上·河南郑州·期末 查看更多[9]
河南省郑州市中原区2022-2023学年七年级上学期期末数学试题广东省揭阳市惠来县2022-2023学年八年级下学期期末数学试题广西壮族自治区贵港市港南区2022-2023学年八年级下学期期末数学试题广西壮族自治区河池市东兰县2022-2023学年八年级下学期期末数学试题(已下线)专题4.27 线与角中的折叠与重合问题(分层练习)(培优练)-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)寒假作业14 角中的动态问题-【寒假分层作业】2024年七年级数学寒假培优练(人教版)(已下线)专题4.28 线与角中的折叠与重合问题(分层练习)(培优练)-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6.31 线与角中的折叠与重合问题(分层练习)(培优练)-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)河南省信阳市罗山县2023-2024学年七年级上学期期末数学试题
更新时间:2023-05-06 11:25:42
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,,A,B分别为直线
、
上两点,且
,若射线
绕点A顺时针旋转至
后立即回转,射线
绕点B逆时针旋转至
后立即回转,两射线分别绕点A、点B不停地旋转,射线
转动的速度是
/秒,射线
转动的速度是
/秒,a、b满足
.若射线
绕点A顺时针先转动18秒,射线
才开始绕点B逆时针旋转,在射线
到达
之前,问射线
再转动多少秒时,
?
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解答题-作图题
|
适中
(0.65)
【推荐2】如图所示,点O是直线
上一点,
,
平分
.若
,求
的度数.(请补全以下求解过程中的空格)
![](https://img.xkw.com/dksih/QBM/2023/3/19/3197985107927040/3200688537247744/STEM/73a7989715864acfb140f2e193de3a91.png?resizew=142)
解:
是直线
上一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f3da2be7349ba9eda909f40fe220bb.png)
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c775f482e73c19ae9bf0dae4c2e119.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcc6ea3a5df3a1c0104f36b3c51455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/2023/3/19/3197985107927040/3200688537247744/STEM/73a7989715864acfb140f2e193de3a91.png?resizew=142)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16181679e69485421aadd6b982636ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1793800cf3a31b46c9299a3c02cdd749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f3da2be7349ba9eda909f40fe220bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3a8dc46f3fe75ae42d223923e13268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4061d189e971edc2f6e5a1c3b7671895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1570c69a8861a539815adcebbbab2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c775f482e73c19ae9bf0dae4c2e119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14819ef92f001f20bd478cc9cfc9ccc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知点
在直线
上,点
、
与点
、
分别在直线
两侧,且
,
(1)如图1,若
平分
,求
的度数;
(2)如图2,在(1)的条件下,
平分
,过点
作射线
,
,求
的度数;
(3)如图3,若
,在
的内部作一条射线
,若
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18c7dc38750d0e1787adee0055543d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb59ddf4f442f20767fb6d894a8f7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/4632066d-e3b5-4d87-9a22-3826ef13855d.png?resizew=324)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/8f0a4939-f83d-43d3-9c93-0c82773894ed.png?resizew=366)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)如图2,在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34339cd730191fb52b99d0aa1862cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155bdf43719f34f20418ea2c21763588.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19513399ef571017ded21e16a67d5dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595dd11a62359a5c894fe286d453ec6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc3a7fd242daea11b1e00032766028a.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知,在下列各图中,点O为直线AB上一点,∠AOC=60°,直角三角板的直角顶点放在点处.
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109293221117952/2111464729542656/STEM/de7933c75ce64e6186d2e7d5bb667762.png?resizew=459)
(1)如图1,三角板一边OM在射线OB上,另一边ON在直线AB的下方,则∠BOC的度数为 °,∠CON的度数为 °;
(2)如图2,三角板一边OM恰好在∠BOC的角平分线OE上,另一边ON在直线AB的下方,此时∠BON的度数为 °;
(3)请从下列(A),(B)两题中任选一题作答.
我选择: .
(A)在图2中,延长线段NO得到射线OD,如图3,则∠AOD的度数为 °;∠DOC与∠BON的数量关系是∠DOC ∠BON(填“>”、“=”或“<”);
(B)如图4,MN⊥AB,ON在∠AOC的内部,若另一边OM在直线AB的下方,则∠COM+∠AON的度数为 °;∠AOM﹣∠CON的度数为 °.
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109293221117952/2111464729542656/STEM/de7933c75ce64e6186d2e7d5bb667762.png?resizew=459)
(1)如图1,三角板一边OM在射线OB上,另一边ON在直线AB的下方,则∠BOC的度数为 °,∠CON的度数为 °;
(2)如图2,三角板一边OM恰好在∠BOC的角平分线OE上,另一边ON在直线AB的下方,此时∠BON的度数为 °;
(3)请从下列(A),(B)两题中任选一题作答.
我选择: .
(A)在图2中,延长线段NO得到射线OD,如图3,则∠AOD的度数为 °;∠DOC与∠BON的数量关系是∠DOC ∠BON(填“>”、“=”或“<”);
(B)如图4,MN⊥AB,ON在∠AOC的内部,若另一边OM在直线AB的下方,则∠COM+∠AON的度数为 °;∠AOM﹣∠CON的度数为 °.
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解答题-计算题
|
适中
(0.65)
【推荐3】阅读与理解:
如图1,直线
,点P在a,b之间,M,N分别为a,b上的点,P,M,N三点不在同一直线上,
与
的夹角为
,
与b的夹角为β,则
.
理由如下:
过P点作直线
,因为
,所以
(如果两条直线都与第三条直线平行,那么这两条直线也互相平行).所以
(两直线平行,内错角相等),所以
,即
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/0994ddff-04cc-489d-8348-a309493202bf.png?resizew=500)
计算与说明:
已知:平面上一点O和线段
,
.
(1)当点O在线段
之间时,如图2,
平分
,
平分
,若
,则
的度数为 .
(2)当点O位于图3的位置时,连接
,请问:
与
有怎样的数量关系?并说明理由.
如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc6d795a7d526e52738a6f7d9323d12.png)
理由如下:
过P点作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8d8a7efe6dd2bf2b445297fd90272f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047b5e078e51edfa1d692b7f6a8db049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29dcff2a773a4437f2054cb7b4c941ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f80668d1a5049a106fc6b582ee3f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc6d795a7d526e52738a6f7d9323d12.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/0994ddff-04cc-489d-8348-a309493202bf.png?resizew=500)
计算与说明:
已知:平面上一点O和线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(1)当点O在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8407954a328c08add8decf551fa4340d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7500c57c4d892485b337727e6ceaaa33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
(2)当点O位于图3的位置时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b26075ea855e1504fe8d2e3aec383b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ca9a8495b6e49723f0e1e9a5bda8cf.png)
您最近一年使用:0次