若
的度数是
的度数的k倍,则规定
是
的k倍角.
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363507632242688/2364003970957312/STEM/8cac5d8a27f843b790196a0d1f603438.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363507632242688/2364003970957312/STEM/e725511a562f4a049ad1d0bd3af419db.png?resizew=161)
(1)若∠M=21°17',则∠M的5倍角的度数为 ;
(2)如图1,OB是∠AOC的平分线,OD是∠COE的平分线,若∠AOC=∠COE,请直接写出图中∠AOB的所有3倍角;
(3)如图2,若∠AOC是∠AOB的5倍角,∠COD是∠AOB的3倍角,且∠AOC和∠BOD互为补角,求∠AOD的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363507632242688/2364003970957312/STEM/8cac5d8a27f843b790196a0d1f603438.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363507632242688/2364003970957312/STEM/e725511a562f4a049ad1d0bd3af419db.png?resizew=161)
(1)若∠M=21°17',则∠M的5倍角的度数为 ;
(2)如图1,OB是∠AOC的平分线,OD是∠COE的平分线,若∠AOC=∠COE,请直接写出图中∠AOB的所有3倍角;
(3)如图2,若∠AOC是∠AOB的5倍角,∠COD是∠AOB的3倍角,且∠AOC和∠BOD互为补角,求∠AOD的度数.
19-20七年级上·吉林延边·期末 查看更多[5]
吉林省延边朝鲜族自治州安图县第三中学2019-2020学年七年级上学期期末数学试题广东省广州市越秀区广东华侨中学2019-2020学年七年级上学期期末数学试题江西省南昌市东湖区2019-2020学年七年级上学期期末数学试题河南省信阳市平桥区2020-2021学年七年级上学期期末数学试题(已下线)专题4.20 角的有关计算压轴题(专项练习)-2022-2023学年七年级数学上册基础知识专项讲练(北师大版)
更新时间:2019-12-27 09:21:18
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【推荐1】对于三个数a,b,c,M{a,b,c}表示a,b,c这三个数的平均数,min{a,b,c}表示a,b,c这三个数中最小的数,如:
,min{﹣1,2,3}=﹣1;
,min{﹣1,2,a}=
;解决下列问题:
(1)填空:min{﹣22,
,
}=_______;
(2)若min{2,2x+2,4﹣2x}=2,求x的取值范围;
(3)①若M{2,x+1,2x}=min{2,x+1,2x},那么x=______;
②根据①,你发现结论“若M{a,b,c}=min{a,b,c},则_______(填a,b,c的大小关系);
③运用②解决问题:若M{2x+y+2,x+2y,2x﹣y}=min{2x+y+2,x+2y,2x﹣y},求x+y的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67795f004f3b2dd6884bfa8666f82ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51db8ec6e2665d9ed3893e26daaaf934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd285c6cc0360fdef930dc050ee31e19.png)
(1)填空:min{﹣22,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de104c531e2c0689ea501f322433532f.png)
(2)若min{2,2x+2,4﹣2x}=2,求x的取值范围;
(3)①若M{2,x+1,2x}=min{2,x+1,2x},那么x=______;
②根据①,你发现结论“若M{a,b,c}=min{a,b,c},则_______(填a,b,c的大小关系);
③运用②解决问题:若M{2x+y+2,x+2y,2x﹣y}=min{2x+y+2,x+2y,2x﹣y},求x+y的值.
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【推荐2】如图,等边△ABC的边长为6cm,点P从顶点A出发沿AB运动,同时点Q从点C出发沿BC的延长线运动,点P,Q的速度都是1cm/s,点P到达点B时,两点停止运动,连接PQ交AC于点D,作PE
AC于点E.
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020987370528768/3021054245535744/STEM/4edccf8a142849f59cb86b5b709098d4.png?resizew=164)
(1)当△CDQ是等腰三角形时,求它们的运动时间;
(2)求证:DE的值与运动时间无关.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020987370528768/3021054245535744/STEM/4edccf8a142849f59cb86b5b709098d4.png?resizew=164)
(1)当△CDQ是等腰三角形时,求它们的运动时间;
(2)求证:DE的值与运动时间无关.
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【推荐1】已知点O是直线AB上的一点,∠COE=90°,OF是∠AOE的平分线.
(1)当点C.E.F在直线AB的同侧(如图1所示)①若∠COF=25°,求∠BOE的度数;②若∠COF=α°,则∠BOE= .
(2)当点C与点E.F在直线AB的两旁(如图2所示)时,(1)中第②式的结论是否仍然成立?请给出你的结论并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/1/17/2379181783465984/2379751624032256/STEM/2e5183e927a1472590bc95225e69a617.png?resizew=217)
(1)当点C.E.F在直线AB的同侧(如图1所示)①若∠COF=25°,求∠BOE的度数;②若∠COF=α°,则∠BOE= .
(2)当点C与点E.F在直线AB的两旁(如图2所示)时,(1)中第②式的结论是否仍然成立?请给出你的结论并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/1/17/2379181783465984/2379751624032256/STEM/2e5183e927a1472590bc95225e69a617.png?resizew=217)
![](https://img.xkw.com/dksih/QBM/2020/1/17/2379181783465984/2379751624032256/STEM/3d3d15fda0e648799430898c9d454cb5.png?resizew=181)
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【推荐2】已知
、
共顶点O,
平分
,
平分
.
(1)如图1,当
与
重合时,若
,
,求
的度数;
(2)将
绕点O逆时针旋转一个角α至图2所示位置,设
,求
的度数(用
、
表示);
(3)在(1)条件下,将
从图1所示位置逆时针以每秒2°的速度旋转,设运动时间为
秒(
),当
时,
的值为 .(直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1e2a60c37ebc303d4fc2bf3d6a234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/25d046ca-de26-4ba6-8269-5f4be5abc736.png?resizew=613)
(1)如图1,当
![](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/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b2c6df20f3e84d0d7e4c11d2d34daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d1e9ca03a2c35c9a59fb3609b9fe48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)在(1)条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88706cbfe1698e2266e68734c495fbaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343f9c09b1dbc665aeff715f97936715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐3】若
,我们则称
是
的“绝配角”.例如:若
,
,则
是
的“绝配角”,请注意:此时
不是
的“绝配角”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/ace47758-f48d-4acf-b0e9-e07d40f1afc1.png?resizew=563)
(1)如图1,已知
,在
内存在一条射线
,使得
是
的“绝配角”,此时
______:(直接填写答案)
(2)如图2,已知
,若平面内存在射线
、
(
在直线
的上方),使得
是
的“绝配角”,
与
互补,求
大小:
(3)如图3,若
,射线
从
出发绕点O以每秒
的速度逆时针旋转,射线
绕点O从
出发以每秒
的速度顺时针旋转,
平分
,
平分
,运动时间为t秒(
).
①当
时,
是
的“绝配角”,求出此时t的值:
②当
时,
______时,
是
的“绝配角”(直接填写答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487588103f75bcddb9b86a61cc00bb2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59391ad0a68d994843e15600f74a280e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d18d538d0a860cc096309cc557cb8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/ace47758-f48d-4acf-b0e9-e07d40f1afc1.png?resizew=563)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](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/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ca8efe3c3e3648ffefa4e29e6cf51b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](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/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78c8909f841da5022bbe3682d377295.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ba5b30f8b1eb27bb462f33bd14d7b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360bf54642118f681beab977dcef8b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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解答题-问答题
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较难
(0.4)
【推荐1】已知点A,点
分别在线段
,
上,
.
,求证:
;
(2)分别过点A和点
作直线
、
使
,以点
为顶点的直角
绕点
旋转,并且
的两边分别与直线
,
交于点
和点
,如图
试判断
、
之间的数量关系,并说明理由;
(3)在(2)的条件下,若
和
恰好分别平分
和
,并且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19f085f2901aef62719cb8df1781dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966a7257fd3af3a4049844773c611e26.png)
(2)分别过点A和点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5715c18d366125d2ea34eed5623e982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc32e15378120a26376e347b764f864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc32e15378120a26376e347b764f864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cf5d8784e1c3f5132a7915010c1be5.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a91f89a0bc06bd1613e4ec4011e6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e0b796ca8d0194461f1d23e606bf58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
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【推荐2】已知
,射线OP从OB出发,绕O逆时针以1°/秒的速度旋转,射线OQ从OA出发,绕O顺时针以3°/秒的速度旋转,两射线同时出发,运动时间为t秒![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f382dd6ae71eaec4a08b50b7cc66638.png)
(1)当
秒时,求
;
(2)当
,求
的值;
(3)射线OP,OQ,OB,其中一条射线是其他两条射线所形成的角的平分线,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e847513a54d0e5a8433f583767ccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f382dd6ae71eaec4a08b50b7cc66638.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57127a1bae23a6d3a266ffae18601f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10aa98b163ade82dcadbe8dd3b73e42e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7df99fe6438442a9453fc0c57fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)射线OP,OQ,OB,其中一条射线是其他两条射线所形成的角的平分线,求t的值.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804599863894016/2807117995728896/STEM/b17d3262-3ca1-46df-b561-f59d9ed3c26c.png?resizew=264)
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【推荐3】丁丁学习七年级下册数学后,遇到了一些问题,请你帮他解决一下.
![](https://img.xkw.com/dksih/QBM/2021/7/29/2774437498290176/2780487082885120/STEM/d0bfdf177fff4817986ab168e5e52223.png?resizew=529)
(1)如图1,已知AB
CD,点E在两平行线的内侧,连接AE,CE.若∠EAB=35°,∠ECD=25°,求∠AEC的度数;(提示:过点E作AB的平行线)
(2)如图2,已知AB
CD,点E在两平行线的外侧,连接AE,CE.若∠EAB=α,∠ECD=β.
①求∠AEC的大小(用含α,β的代数式表示);
②作∠ECD的平分线交AB于点G,连接GE,AG平分于∠CGE(如图3).若∠AEG=130°,α+β=80°,分别求出α,β的度数.
![](https://img.xkw.com/dksih/QBM/2021/7/29/2774437498290176/2780487082885120/STEM/d0bfdf177fff4817986ab168e5e52223.png?resizew=529)
(1)如图1,已知AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)如图2,已知AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
①求∠AEC的大小(用含α,β的代数式表示);
②作∠ECD的平分线交AB于点G,连接GE,AG平分于∠CGE(如图3).若∠AEG=130°,α+β=80°,分别求出α,β的度数.
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