如图,已知
,且
,
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/8c8e6eff-f55e-470b-9feb-03cc5b8107aa.png?resizew=124)
(1)求
的度数;
(2)如果
,其它条件不变,求
的度数;
(3)如果
,其它条件不变,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/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71bb53109aab57cf279b83839386d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/8c8e6eff-f55e-470b-9feb-03cc5b8107aa.png?resizew=124)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6978615637bd3febf56d23798f65306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cc7fec25d61981c418248e5e933cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(4)从(1)(2)(3)中你能看出什么规律.
更新时间:2022-12-14 18:45:29
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,将△ABC纸片沿DE折叠,使点C落在四边形ABDE内点C’的位置,
(1)①若
,则
;
②若
,则
;
③探索
、
与
之间的数量关系,并说明理由;
(2)直接按照所得结论,填空:
①如图中,将△ABC纸片再沿FG、MN折叠,使点A、B分别落在△ABC内点A’、B’的位置,则
;
②如图中,将四边形ABCD按照上面方式折叠,则
;
③若将n边形
也按照上面方式折叠,则
;
(3)如图,将△ABC纸片沿DE折叠,使点
落在△ABC边
上方点
的位置, 探索
、
与
之间的数量关系,并说明理由.
(1)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b519d3c67e6388bb183e943776a290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459459559720ab5e154a80723c47cc30.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213070c86351cb6211152d56dcdca4f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa61f1be96d581867ea9f074420a2252.png)
③探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(2)直接按照所得结论,填空:
①如图中,将△ABC纸片再沿FG、MN折叠,使点A、B分别落在△ABC内点A’、B’的位置,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20f719f427f576c5cf61c5447ac1785d.png)
②如图中,将四边形ABCD按照上面方式折叠,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d829f90bf1d518db2549eb0c0d8bcffd.png)
③若将n边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20b1b24649629c474cb9adfe84f4239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab604b38ccca5786c52cd20dced730b7.png)
(3)如图,将△ABC纸片沿DE折叠,使点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3557809c066e68395b614535a7675e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.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/2024/5/22/154a3606-e2ba-46f0-a9c2-149173963809.png?resizew=220)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在等腰
中,
,
,以斜边
为一条直角边,向外作另一直角边长为1的
,依次作下去,记
的面积为
,
的面积为
,
的面积为
,…,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/f9ffbf75-9c2f-41ed-8bc5-2d425471f0e5.png?resizew=207)
(1)
___________,
___________;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b352fa3e781df195ceccca90c3932a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ec371d5dbc19d236bf8a1f084031e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8516e7f1c9819378bccd614a544ed18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1dc04ca41c0b83d58eed33be7b75a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/f9ffbf75-9c2f-41ed-8bc5-2d425471f0e5.png?resizew=207)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9620357ea5be4037cfdccd09a27d3862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5be53b55c0137441a74841fd77c1244.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图1,点O为直线AB上一点,过点O作射线OC,使∠BOC=120°,将一直角三角板的直角顶点放在点O处,一边OM在射线OB上,另一边ON在直线AB的下方.
(1)将图1中的三角板绕点O逆时针旋转至图2,使一边OM在∠BOC的内部,且恰好平分∠BOC,设ON的反向延长线为OD,则∠COD= °,∠AOD= °.
(2)将图1中的三角板绕点O顺时针旋转至图3,使ON在∠AOC的内部,求∠AOM﹣∠NOC的度数.
(1)将图1中的三角板绕点O逆时针旋转至图2,使一边OM在∠BOC的内部,且恰好平分∠BOC,设ON的反向延长线为OD,则∠COD= °,∠AOD= °.
(2)将图1中的三角板绕点O顺时针旋转至图3,使ON在∠AOC的内部,求∠AOM﹣∠NOC的度数.
![](https://img.xkw.com/dksih/QBM/2019/1/7/2113496582586368/2115023865577473/STEM/8797ca69302a481f98f2389a15d4bb26.png?resizew=449)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知O为直线
上一点,射线
表示正北方向,
,射线
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/c3195604-5527-4fd7-86b0-3c7d68a05136.png?resizew=318)
图1 图2
(1)如图1,若
,求
的度数;
(2)若将
绕点O旋转到如图2的位置,试判断
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/c3195604-5527-4fd7-86b0-3c7d68a05136.png?resizew=318)
图1 图2
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86bfc7636a41b4546bbef3c6ad434a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在探究三角形的内角和的小组活动中,小颖作如下辅助线:延长△ABC的边BC到D,作CE∥AB,于是小颖得出三角形内角和的证明方法.
(1)求证:∠A+∠B+∠ACB=180°;
(2)如果CE平分∠ACD,AC=5,求BC的长.
(1)求证:∠A+∠B+∠ACB=180°;
(2)如果CE平分∠ACD,AC=5,求BC的长.
![](https://img.xkw.com/dksih/QBM/2019/1/2/2110045106872320/2111730685632512/STEM/01d5138664b34f37bd705f672a784ff5.png?resizew=200)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,直线AB、CD相交于点O,OE平分∠BOD,∠AOC=72°,∠DOF=90°.
(1)求∠DOE的度数;
(2)求∠EOF的度数.
(1)求∠DOE的度数;
(2)求∠EOF的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089711076237312/2094342139723776/STEM/97ca6917366a4d6d89e7ebc1c89fb052.png?resizew=162)
您最近一年使用:0次