如图,
,
.
;
(2)若
平分
,
于
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9043152324c7fd85fc70623c0e4348db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d67aa2a39c15abaa0cbc09432f1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d4a835472fa987305d4ffb6ecf11e1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136270288edd89d77728dbf602c2e2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
更新时间:2024-04-19 15:47:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】直线AB、CD被直线
所截,EF分别交
于M,N,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fe5d615b75ae31a59b51de2cd14c3f.png)
平分
.
(1)如图1,若
,求
的度数.
(2)如图2,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5222c7772f59f9b22996c406b48fce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fe5d615b75ae31a59b51de2cd14c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbcf2569d4a59b3427abd41288b57dc.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e52f91bde7d6e493653f3c2d2d0842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e861a5b1e5ad5377d31ce00c508d52b4.png)
(2)如图2,若
![](https://img.xkw.com/dksih/QBM/2012/8/16/1573489024286720/1573489057906688/STEM/e91055048e8142629426727fab2c5c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e861a5b1e5ad5377d31ce00c508d52b4.png)
![](https://img.xkw.com/dksih/QBM/2012/8/16/1573489024286720/1573489057906688/STEM/b0e1b1ef730e44cabd8cbddd7edddaa4.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,有一张长方形纸条
,
,在线段
,
上分别取点G,H,将四边形
沿直线
折叠,点C,D的对应点为
,
,将四边形
沿直线
折叠,点A,B的对应点为
,
,设
.
、
在直线
的上方,当
且满足
时,求
的度数.
(2)在(1)的条件下,猜想直线
和
的位置关系,并证明
(3)在点G,H运动的过程中,若
,请直接用含有
的式子表示
的度数
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94606fd5df48e92ceec0d21f8bd3ca29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ff62af083c82873ab82835662d9131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af2577e349157f70effa2a074c9c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e01c515c3188557f530c9574ca6767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84af857b7c2db51841c8359ec0f0a65.png)
(2)在(1)的条件下,猜想直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(3)在点G,H运动的过程中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e01c515c3188557f530c9574ca6767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84af857b7c2db51841c8359ec0f0a65.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图1,直线DE上有一点O,过点O在直线DE上方作射线OC.将一直角三角板AOB(∠OAB=30°)的直角顶点放在点O处,一条直角边OA在射线OD上,另一边OB在直线DE上方.将直角三角板绕着点O按每秒10°的速度逆时针旋转一周,设旋转时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/e695c6e1-aefb-4303-a6b5-8779ab8fe21e.png?resizew=524)
(1)当直角三角板旋转到如图2的位置时,OA恰好平分∠COD,此时,∠BOC与∠BOE之间有何数量关系?并说明理由.
(2)若射线OC的位置保持不变,且∠COE=140°.
①则当旋转时间t= 秒时,边AB所在的直线与OC平行?
②在旋转的过程中,是否存在某个时刻,使得射线OA,OC与OD中的某一条射线是另两条射线所夹角的角平分线?若存在,请求出所有满足题意的t的取值.若不存在,请说明理由.
③在旋转的过程中,当边AB与射线OE相交时(如图3),求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/e695c6e1-aefb-4303-a6b5-8779ab8fe21e.png?resizew=524)
(1)当直角三角板旋转到如图2的位置时,OA恰好平分∠COD,此时,∠BOC与∠BOE之间有何数量关系?并说明理由.
(2)若射线OC的位置保持不变,且∠COE=140°.
①则当旋转时间t= 秒时,边AB所在的直线与OC平行?
②在旋转的过程中,是否存在某个时刻,使得射线OA,OC与OD中的某一条射线是另两条射线所夹角的角平分线?若存在,请求出所有满足题意的t的取值.若不存在,请说明理由.
③在旋转的过程中,当边AB与射线OE相交时(如图3),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7160bba46ed0f4f3269f6d1334869c3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】(1)【问题】如图1,若
,
,
.则
______;
(2)【问题归纳】如图1,若
,请猜想
,
,
之间有何数量关系?请说明理由;
(3)【联想拓展】如图2,
,点
在
的上方,问
,
,
之间有何数量关系?直接写出结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99243f3c14e0d100fa660c61cf29cb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543c783dd6b903185a3fdfc5ce670c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bca8f0e5131fa1ad3df79062a2bda93.png)
(2)【问题归纳】如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acb6b5359a901c5b5a71f32f7f6ca32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d5b88cdac96fd5aeb53283673fafe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(3)【联想拓展】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/c0ff8ae98a4922abf8c86c8028d9a067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,∠A=∠B.
![](https://img.xkw.com/dksih/QBM/2022/8/6/3038580219101184/3073672390377472/STEM/5a6ec8cd34884941b1af4304a9cd54b4.png?resizew=144)
(1)用直尺和圆规作图:过点C作CE
AB(不写作法,保留作图痕迹);
(2)求证:CE平分∠BCD.
![](https://img.xkw.com/dksih/QBM/2022/8/6/3038580219101184/3073672390377472/STEM/5a6ec8cd34884941b1af4304a9cd54b4.png?resizew=144)
(1)用直尺和圆规作图:过点C作CE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
(2)求证:CE平分∠BCD.
您最近一年使用:0次