如图,点
、
、
、
在同一直线上,点
、
分别在直线
两侧,且AE∥DF,
平分
,
平分
,求证:AB∥CD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2563222151299072/2564391439220736/STEM/852882de-3f2a-4d43-8403-a0d6a61b042a.png?resizew=258)
更新时间:2020-10-05 12:10:39
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知
中,
平分
,点
在射线
上.
,
,求
的度数;
(2)如图②,若
,
,求
的度数;
(3)如图③,若
,
,直线
与
的一条边垂直,则
的度数为______.(直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4da037fe7fa1dff1116c17df53a99f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3e25eb442bfd56eb5276fdd209be95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df055e9b82f0590171adf25dd97df6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a696d4edaa7d97a92b2a15e564699.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af429802ee2f5b7d309877c15947e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069bbd27b88dc3e804ff751ccbecfca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a696d4edaa7d97a92b2a15e564699.png)
(3)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3e25eb442bfd56eb5276fdd209be95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538489aceed7d0b03e0394638c6c2419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a696d4edaa7d97a92b2a15e564699.png)
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适中
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【推荐2】如图,直线
、
相交于点
,
平分
,
平分
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/2e878dbc-933c-463f-a534-cc85a0b02c42.png?resizew=136)
(1)求
的度数;
(2)求
的度数.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f269ec12011d060ce72b829d9b6cb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/2e878dbc-933c-463f-a534-cc85a0b02c42.png?resizew=136)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
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解答题-证明题
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适中
(0.65)
【推荐3】已知:O为直线AB上的一点,射线OA表示正北方向,射线OC在北偏东m°的方向,射线OE在南偏东n°的方向,射线OF平分∠AOE,且2m+2n=180.
(1)如图1,∠ COE=______°, ∠COF和∠BOE之间的数量关系为________________.
![](https://img.xkw.com/dksih/QBM/2011/3/4/1577468340060160/1577468421603328/STEM/e1fe18aa-1cce-44e9-8409-4bd82c62a31f.png?resizew=146)
(2)若将∠COE绕点O旋转至图2的位置,射线OF仍然平分∠AOE时,试问(1)中∠COF和∠BOE之间的数量关系是否发生变化?若不发生变化,请你加以证明,若发生变化,请你说明理由;
![](https://img.xkw.com/dksih/QBM/2011/3/4/1577468340060160/1577468421603328/STEM/088e3e75-8c94-4a6b-8a80-69ef2fb1e76e.png?resizew=155)
(3)若将∠COE绕点O旋转至图3位置,射线OF仍平分∠AOE时,则2 ∠COF+∠BOE= _°.
(1)如图1,∠ COE=______°, ∠COF和∠BOE之间的数量关系为________________.
![](https://img.xkw.com/dksih/QBM/2011/3/4/1577468340060160/1577468421603328/STEM/e1fe18aa-1cce-44e9-8409-4bd82c62a31f.png?resizew=146)
(2)若将∠COE绕点O旋转至图2的位置,射线OF仍然平分∠AOE时,试问(1)中∠COF和∠BOE之间的数量关系是否发生变化?若不发生变化,请你加以证明,若发生变化,请你说明理由;
![](https://img.xkw.com/dksih/QBM/2011/3/4/1577468340060160/1577468421603328/STEM/088e3e75-8c94-4a6b-8a80-69ef2fb1e76e.png?resizew=155)
(3)若将∠COE绕点O旋转至图3位置,射线OF仍平分∠AOE时,则2 ∠COF+∠BOE= _°.
![](https://img.xkw.com/dksih/QBM/2011/3/4/1577468340060160/1577468421603328/STEM/bd572108-8218-45a2-be47-c96eeaf6911e.png?resizew=147)
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解答题-证明题
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适中
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【推荐1】填空并完成以下证明:
已知,如图,
于H,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/58e60ef3-c243-485f-935f-8317c78f41bf.png?resizew=200)
证明:
(已知)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2485b9b0a8f7703bcfa69f160c540a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
∵
(已知)
∴
( )
∴
.( )
∵
(已知)
∴
.( )
∴
( )
∴
( )
∴
.
已知,如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f404f8738598e8042415472b27c2a395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/58e60ef3-c243-485f-935f-8317c78f41bf.png?resizew=200)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bb5ccceb997622add983ee2dc68522.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2485b9b0a8f7703bcfa69f160c540a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cecb98f2569e9c8fc6b29b2e5fece38.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3924f895faf897565b92f31043c13e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b25b0d0f3e993e186f6c3bb5f55bad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,点
,
分别在直线
,
上,
为
,
之间一点,连接
,过点
作
,交
于点
,
.
;
(2)如图2,
平分
,点
为线段
上一点,连接
.
①若
,求
的度数;
②如图3,
平分
,交
于点
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/2a30f3a8b673cc28bd90c50cf1a35281.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/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc7dd12a19c595e031e228d63c485ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a7228055c0b8d456868b244ffab8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a13b7c0e1c488447dfa0b234991e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6165d5ec3184c0b2fae4afadb8e43999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d034d287d9e7482e6521a50864f99643.png)
②如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf603857b0fe876fb4130cf8684c2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb6851f723c05af696e002f72b6cb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03debd9a024476623b825559cddc31cc.png)
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