1 . 小明阅读了教材中“借助三角尺画角”的探究活动(如图1、图2的实物图所示),他在老师指导下画出了图1所对应的几何图形,并标注了所使用三角尺的相应角度(如图3),他发现用一副三角尺还能画出其他特殊角.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5d21d363-c422-4484-b078-f1a137e6be25.png?resizew=486)
(1)请你借助三角尺画出图2对应的几何图形,并标注所使用三角尺的相应角度;
(2)结合画图再思考:用一副三角尺画出的角的大小有什么规律;
(3)图3中,若
平分
平分
,请在图3中补全图形求出
的度数,并猜想
与
的数量关系;
(4)如图4,若
是任意角,
在
的外部,
平分
平分
的条件不变,第(3)题中
与
的数量关系是否发生变化,如果结论不变请说明理由;如果变化,请写出新结论并给出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5d21d363-c422-4484-b078-f1a137e6be25.png?resizew=486)
(1)请你借助三角尺画出图2对应的几何图形,并标注所使用三角尺的相应角度;
(2)结合画图再思考:用一副三角尺画出的角的大小有什么规律;
(3)图3中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb45399379c533ae60617e5614e787a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(4)如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb45399379c533ae60617e5614e787a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
您最近一年使用:0次
2 . 如图,已知线段
,
,线段
在线段
上运动(点C不与点A重合),点E、F分别是
、
的中点.
,则
______
;
(2)当线段
在线段
上运动时,试判断线段
的长度是否会发生变化,如果不变,请求出线段
的长度;如果变化,请说明理由;
(3)我们发现角的很多规律和线段一样,如图2,已知
在
内部转动,
、
分别平分
和
.类比以上发现的线段的规律,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5da671e502593a024ea236e48fa0de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b5f8acda412ddceb94c4e4e6b7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/1bfe6362e241ce790c6c30dfdfe72f07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/49b50357a6545cae8348e3059312f520.png)
(3)我们发现角的很多规律和线段一样,如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a670a5703fbad193b0212079c6c8933f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
您最近一年使用:0次
2024-02-05更新
|
17次组卷
|
9卷引用:河北省石家庄市高邑县2022-2023学年七年级上学期期中考试数学试题
河北省石家庄市高邑县2022-2023学年七年级上学期期中考试数学试题(已下线)专题4.25 类比思想探究线段和角的大小(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)专题4.26 类比思想探究线段和角的大小(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)河南省信阳市固始县2021-2022学年七年级上学期期末数学试题河北省邯郸市永年区2022-2023学年七年级上学期期中考试数学试题山西省吕梁市交口县2022-2023学年七年级上学期期末学业水平达标检测数学试题云南省普洱市2023-2024学年七年级上学期期末数学试题河南省周口市太康县2023-2024学年七年级上学期期末数学试题山东省淄博市高青县2023-2024学年六年级下学期期中数学试题
名校
3 . 在数学的学习过程中,我们要不断地归纳,思考和迁移,这样才能提高我们解决问题的能力:规律发现:在学完《数轴》这节课后,小明的作业有两道小题,请你帮他把余下的两空完成:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/6012b2f8-81ad-4cf4-bde7-b6a30e8bc036.png?resizew=610)
(1)若点
表示的数是
,点
表示的数是
,则线段
的中点
表示的数为______.
(2)直接运用:将数轴按如图(1)所示从某一点开始折出一个等边三角形
,设点
表示的数为
,点
表示的数为
,
表示的数为
,则
值为______,若将
从图中位置向右滚动,则数字2014对应点将与
的顶点重合.
(3)类比迁移:如图(2):
,
,
,若射线
绕
点每秒
的速度顺时针旋转,射线
绕
点每秒
的速度顺时针旋转,射线
以每秒
的速度逆时针旋转,三线同时旋转,当一条射线与直线
重合时,三条射线同时停止运动.问:运动几秒时,其中一条射线是另外两条射线夹角的平分线?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/6012b2f8-81ad-4cf4-bde7-b6a30e8bc036.png?resizew=610)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直接运用:将数轴按如图(1)所示从某一点开始折出一个等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e26ea0261f2b67983b07b8d0bb8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ac7fa45d1a150d095f7ae45aab0696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b8d3f7a166ff5db92d9ee0014a960d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)类比迁移:如图(2):
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7808041f5f0e44337b10071b8a40ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54276d36db232bc3ae6327f757241c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67857288bd09549b4092fbe598029137.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/3c030b25575d683af91c06e6a3e4f463.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/8291c8190d1ee0e00372473c2ac9eff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da1c094648e6344416cdb2bbbf8c61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb780c38866c437ef52b2a9f7d508a0b.png)
您最近一年使用:0次
4 . 如图甲,已知线段
,
线段
在线段
上运动(不与端点
、
重合),E、F分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/afd120bf-ea3a-48f4-8e16-fe51cdf93acd.png?resizew=399)
(1)观察发现:若
,则
______cm.
(2)拓展探究:当线段
在线段
上运动时,试判断
的长度是否发生变化?如果不变,求出
的长度,如果变化,请说明理由.
(3)迁移应用:对于角,也有和线段类似的规律:如图乙,在同一平面内,已知
在
内部转动,
,
分别平分
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
①若
,
,求
;
②请你猜想
,
和
会有怎样的数量关系,直接写出你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9040c9795e7132ebf65ede1f98c4d72b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b5f8acda412ddceb94c4e4e6b7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/afd120bf-ea3a-48f4-8e16-fe51cdf93acd.png?resizew=399)
(1)观察发现:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
(2)拓展探究:当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/49b50357a6545cae8348e3059312f520.png)
(3)迁移应用:对于角,也有和线段类似的规律:如图乙,在同一平面内,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655085672c6bac837c4b54306d63cc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc96919f50801279ee2e368e5c80a376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
②请你猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
您最近一年使用:0次
5 . 将一副三角尺(分别为含
,
,
和
,
,
的角的两个三角尺)叠放在量角器上,
,
分别平分
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/3977da52-6e73-4eec-97e6-f7556fffcc88.png?resizew=458)
(1)特例感知:如图1,若点A,O,D在同一直线上,边
与量角器
刻度线重合,边
与量角器
刻度线重合,则
__________
;
(2)规律探究:如图2,当两个三角尺有重叠时,
①当
时,则
__________
;
②当
时,求
的度数(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/3977da52-6e73-4eec-97e6-f7556fffcc88.png?resizew=458)
(1)特例感知:如图1,若点A,O,D在同一直线上,边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)规律探究:如图2,当两个三角尺有重叠时,
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cc7fec25d61981c418248e5e933cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666919ee9a27998101db4b4603da2648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
6 . 如图,已知
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/92a6510f-6214-40bc-ae03-5fea54b739a5.png?resizew=122)
(1)若
与
互为余角,且
,求
的度数;
(2)若
,其他条件不变,求
的度数;
(3)若
,其他条件不变,求
的度数
(4)从(1)(2)(3)中你能看出什么规律?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/92a6510f-6214-40bc-ae03-5fea54b739a5.png?resizew=122)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77603496a315e39db671c0c1e4256cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db91877e869a8d58b2bab2c39756d7fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6978615637bd3febf56d23798f65306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c48b122d08449a4a92af0700163c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(4)从(1)(2)(3)中你能看出什么规律?
您最近一年使用:0次
7 . 如图1,已知线段
,
,线段
在线段
上运动(点
不与点
重合),点
、
分别是
、
的中点.
(1)若
,则
__________
.
(2)当线段
在线段
上运动时,试判断线段
的长度是否会发生变化?如果不变,请求出线段
的长度;如果变化,请说明理由.
(3)我们发现角的很多规律和线段一样,如图2,已知
在
内部转动,
、
分别平分
和
.类比以上发现的线段的规律,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e196fd6dcbbd1967b574a4a3894bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5afb898afb8463343da0424e4c329c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/0c24fe20-100f-43d0-8728-5d13e31b757d.png?resizew=305)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d84c7b455de83e8ba7898cc271b88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/49b50357a6545cae8348e3059312f520.png)
(3)我们发现角的很多规律和线段一样,如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94781f5a613266922fec4a3ff168d95b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b2da7d6ea3385231a0034413bbdb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
您最近一年使用:0次
2023-11-24更新
|
633次组卷
|
7卷引用:河北省石家庄市正定县2023-2024学年七年级上学期期中数学试题
河北省石家庄市正定县2023-2024学年七年级上学期期中数学试题(已下线)七年级数学期末模拟卷02(北师大版七上全册)-学易金卷:2023-2024学年初中上学期期末模拟考试甘肃省兰州市教育局第四片区2023-2024学年七年级上学期期末考试数学试题(已下线)专题6.29 类比思想探究线段和角的大小(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)河北省邯郸市永年区2023-2024学年七年级上学期期末数学试题(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)山东省日照市五莲县2023-2024学年七年级上学期期末数学试题
8 . 如图,
,点
、
分别在直线
,
上,
为直线
和
之间的一个动点,且满足
.
、
、
之间的数量关系为 .
(2)如图2,
、
、
之间的数量关系为 .
(3)如图3,
,
分别平分
和
,点
在
左侧,点
在
右侧.
①若
,求
的度数.
②猜想规律:
与
的数量关系可表示为 .
③如图4,若
与
的角平分线交于点
,
与
的角平分线交于点
,
与
的角平分线交于点
,……依此类推,则
与
的数量关系是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/075b213cd00b7b188210392bf06d326e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd82c51c8a9c1dd494cbb1d9c5411719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d5b88cdac96fd5aeb53283673fafe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddef81e3af08a62a69bc3e56a940bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b858c70410f981ca3e22f791585c7e.png)
②猜想规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b858c70410f981ca3e22f791585c7e.png)
③如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20e7f536e1d4be86215aa478f654edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19809b9c7844952c989a6b5dd6733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b02526e9e13f711f789edd185b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417dbe4ac17819ab6e957d88f9f4281e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae863e7a1f1fed09f1075de4a817c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aee84906a02b90b9bd92db0ae6eb27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6bf6a2cc88e622936ac40db7f0fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f52b152eaf63415b10ed786a58a2747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894f9501a62d8a1995bc504e95205131.png)
您最近一年使用:0次
9 . (规律探究题)如图,在
中,
,
与
的平分线交于点
,得
;
与
的平分线交于点
,得
;⋯;
与
的平分线交于点
,得
.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd3ad5297dc83de7f5591b31c5f5e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74036e4adc6507fe736dced0ea653576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1189af2f5f84a64ba3836f1df1e9080d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c79a50a42b539b28eaf9a47094398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d979cef4edb8db9cc9601bd63311a37f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f413927f7f33abae2d8c36905ecc6406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b5f7dc5b8ac574f04a553ef2c655a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904544bf8ba593555bd26cfb75161a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904544bf8ba593555bd26cfb75161a44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/3fc41676-189d-4278-889b-88fc4ad1e5cf.png?resizew=188)
您最近一年使用:0次
10 . 在数学的学习过程中,我们要不断地归纳,思考和迁移,综合运用所学知识和解题方法,这样才能提高我们解决问题的能力,下面就从学完《数轴》发现的规律,开始我们的探究之旅吧!
规律发现:
(1)点A表示的数是4,点B表示的数是10,则线段
的中点C表示的数为 ;
(2)点A表示的数是
,点B表示的数是5,则线段
的中点C表示的数为 ;
发现:点A表示的数是a,点B表示的数是b,则线段
的中点C表示的数为 .
直接运用:
数轴上有三个不重合的点A、B、C,点A表示的数为
,点B表示的数为
,C表示的数为
,且
,则x值为 .
类比迁移:
如图:
,若射线
绕O点每秒
的速度顺时针旋转,射线
绕O点每秒
的速度顺时针旋转,射线
以每秒
的速度逆时针旋转,三线同时旋转,当一条射线与直线
重合时,三条射线同时停止运动,问:运动几秒时,其中一条射线是另外两条射线夹角的平分线?
问题解答:
①设运动时间为t秒,请用含t的式子表示:
( )度;
( )度;
( )度.
②请直接写出你探究的所有符合条件的运动时间.
规律发现:
(1)点A表示的数是4,点B表示的数是10,则线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)点A表示的数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a94acdfb41489d5694b5a64b9e99754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
发现:点A表示的数是a,点B表示的数是b,则线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
直接运用:
数轴上有三个不重合的点A、B、C,点A表示的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39241f2eeccaa16d0550d851619bcb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8353952f4ec264d745ab12c055009b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa54d2a1b192048f8de9f66f0e14a1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
类比迁移:
如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ef7db713c3634312876be23c856c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb780c38866c437ef52b2a9f7d508a0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/e2dcfb16-2125-48de-ba2a-c8893e71215b.png?resizew=150)
问题解答:
①设运动时间为t秒,请用含t的式子表示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6541dae2df3669a63e85464fb25b9c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79a51395554f5b947e1640eefffad21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a0c58808027490a2e7c7c3179aea3.png)
②请直接写出你探究的所有符合条件的运动时间.
您最近一年使用:0次
2024-01-02更新
|
200次组卷
|
2卷引用:黑龙江省齐齐哈尔市七县联考2023-2024学年七年级上学期期末数学试题