将一副三角板按图1摆放在直线
上,
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/fa1d6ac9-52f8-4c64-912f-205dd0b42144.png?resizew=508)
(1)
;
;
(2)如图2,若将三角板
绕
点以
秒的速度顺时针旋转
秒
,求
的度数;
(3)如图3,三角板
绕
点以
秒的速度顺时针旋转,同时,三角板
绕
点以
秒的速度逆时针旋转,当
与
边首次重合时两三角板都停止运动,若运行
秒时,有
成立,试求此时
与
的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/fa1d6ac9-52f8-4c64-912f-205dd0b42144.png?resizew=508)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0237f5f28194a39de0cd822bb73c97ed.png)
(2)如图2,若将三角板
![](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/8072acdd6b7508f133a514bc5370b110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fc9b0e56794928eb4b294b9b3f5a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b821e29fa0cec75ff48ca59747a71cba.png)
(3)如图3,三角板
![](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/857ecf358f5c46dc204bd23f64b67cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9566ba6cd3aee6023372111fc413ddc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f58e9738e46e7d0b97de1db5fd4b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
2022七年级上·全国·专题练习 查看更多[4]
(已下线)专题27 和三角板有关的角度计算-【微专题】2022-2023学年七年级数学上册常考点微专题提分精练(人教版)山东省济南市济阳区2022-2023学年七年级上学期期末数学试题广东省东莞市光明中学2023-2024学年七年级上学期期末数学试题(已下线)七年级数学开学摸底考(山东济南专用,范围:北师大版七上全部)-2023-2024学年初中下学期开学摸底考试卷
更新时间:2022-12-20 21:21:05
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解答题-问答题
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名校
【推荐1】我们知道
的几何意义是:数轴上表示a的点与原点的距离,即
.这个结论可以推广为:
①
表示在数轴上表示数a、b的两点间的距离;
②
表示在数轴上表示数a、-b的两点间的距离;
根据以上结论探究:
(1)
表示5与2两数在数轴上所对应的两点之间的距离,所以
;
表示5与-2两数在数轴上所对应的两点之间的距离,所以
.
(2)数轴上表示数x的点在1与5之间移动时,
的值是一个固定的值,为 .
(3)要使
,则x= .
(4)若
,写出x的范围______________.
(5)
的最小值是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec806110718f658b220663d35061060d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33ceacb7836ccd98815e08a20cd2be.png)
根据以上结论探究:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4228e4c14b716ff9da204df7c548222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f3148533d8d1b8867c6c7f814c9f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bf8dd39e95e7d1187e7ba68dc9027d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176910f20f34db49f5195564cfd9a58b.png)
(2)数轴上表示数x的点在1与5之间移动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698f01e523ece284c1d34509a8905c4e.png)
(3)要使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24facd1b511a56e36c8fd82cb1d8d15b.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e33f5af4a504ecf452dd9af200244b.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99fb2e6f212e45480b9e4389095512dc.png)
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【推荐2】如图,已知
,P是直线
,
间的一点,
于点F,PE交AB于点E,
.
的度数;
(2)如图2,射线
从
出发,以每秒
的速度绕P点按逆时针方向旋转,当
垂直
时,立刻按原速返回至
后停止运动;射线
从
出发,以每秒
的速度绕E点按逆时针方向旋转至
后停止运动.若射线
,射线
同时开始运动,设运动时间为t秒.
①当
时,求
的度数;
②当
时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.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/544204617f1eb4e26a082a72d27d0bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cb8e776a62924a51e40f09e2d6c450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9040f3659f8f89a0c908648b00e0b65.png)
(2)如图2,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4788318d78565e3eddf28887a5e6d05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadaa018a95ded3269d77fa8013019ff.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329f0f9bf22dbf8e381b96c28ea9c82c.png)
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【推荐1】佛堂古镇的万善浮桥,其夜晚的灯光秀美轮美轮,两岸景观照明还荣获了中国照明学会第十六届照明奖的一等奖.如图1所示,记浮桥两岸所在直线分别为
,且
,浮桥上装有两种不同的激光灯A和激光灯B(假设
以及由A、B两点发出的光射线始终在同一平面内),灯A的光射线以2度每秒的速度从射线
顺时针旋转至射线
后继续回转,灯B的光射线以5度每秒的速度从射线
顺时针旋转到射线
后也继续回转,当打开激光灯的总开关时,激光灯A和激光灯B同时开始转动.
(1)若购买2盏灯A和4盏灯B共需10万元,购买3盏灯A和2盏灯B共需8.6万元,请问:购买灯A和灯B的单价分别是多少万元?
(2)打开总开关,当灯A的光射线第一次从射线
旋转至射线
的过程中,求灯A和灯B的光射线恰好互相垂直时所需要的时间.
(3)如图2,打开总开关,当灯B的光射线第一次从射线
旋转至射线BS的过程中,若灯A和灯B的光射线有交点(记为点O),延长
至点E,作
与
的角平分线并交于点F,求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc86832971275d73debd4ee61302a0a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7060461aed628418102fbaa470993bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc86832971275d73debd4ee61302a0a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3bd41676f6b69acac00a292fe134cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b5e290c6b2c5508a3bf6117afbf7e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/bd4d0f61-b728-4968-92d8-523c541567be.png?resizew=462)
(1)若购买2盏灯A和4盏灯B共需10万元,购买3盏灯A和2盏灯B共需8.6万元,请问:购买灯A和灯B的单价分别是多少万元?
(2)打开总开关,当灯A的光射线第一次从射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128147bd4834566a78b4e9d2a3b2139c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
(3)如图2,打开总开关,当灯B的光射线第一次从射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06dbb35e444cf9be8fe381e654ec14ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ba41689b5ba703490e4b20703d2208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f3fcda5a571e8eecc6269dd37f3e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c056f82c59371a98373d193cda69b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d44a03ac0f0cac5a394833f7aee388f.png)
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【推荐2】如图①,在四边形
中,
,点 E 是
的中点, 若
是
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/0e9a9550-7068-4f6b-9887-78b233867af7.png?resizew=265)
(1)求证:
是
的平分线
(2)线段
之间的数量关系是 ;
问题探究: 如图②.在四边形
中,
,
与
的延长线交于点F, 点E是
的中点, 若
是
的平分线, 试探究
之间的等量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802240838201171d8762fe92112fa3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/0e9a9550-7068-4f6b-9887-78b233867af7.png?resizew=265)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68bc725d833cd9450b11513f6eb46e46.png)
问题探究: 如图②.在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d99852063716e04e73630926a62a63b.png)
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【推荐3】【发现】如图1,CE平分∠ACD,AE平分∠BAC.
(1)当∠EAC=∠ACE=45°时,AB与CD的位置关系是______;
当∠EAC=50°,∠ACE=40°时,AB与CD的位置关系是______;
当∠EAC+∠ACE=90°,请判断AB与CD的位置关系并说明理由;
(2)【探究】如图2,AB∥CD,M是AE上一点,∠AEC=90°保持不变,移动顶点E,使CE平分∠MCD,∠BAE与∠MCD存在怎样的数量关系?并说明理由,
(3)【拓展】如图3,AB∥CD,P为线段AC上一定点,Q为直线CD上一动点,且点Q不与点C重合.直接写出∠CPQ+∠CQP与∠BAC的数量关系.
(1)当∠EAC=∠ACE=45°时,AB与CD的位置关系是______;
当∠EAC=50°,∠ACE=40°时,AB与CD的位置关系是______;
当∠EAC+∠ACE=90°,请判断AB与CD的位置关系并说明理由;
(2)【探究】如图2,AB∥CD,M是AE上一点,∠AEC=90°保持不变,移动顶点E,使CE平分∠MCD,∠BAE与∠MCD存在怎样的数量关系?并说明理由,
(3)【拓展】如图3,AB∥CD,P为线段AC上一定点,Q为直线CD上一动点,且点Q不与点C重合.直接写出∠CPQ+∠CQP与∠BAC的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/fb9b9bb6-81d9-4ca7-8f6c-3b8e5628c0c3.png?resizew=484)
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