填空:如图,在
中,
,
,
.试说明:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/b0f7d5cf-72fa-423a-ad93-39cb50c500b4.png?resizew=147)
证明:∵
,
(_____________),
∴
(___________________)
∴_____________
______________(_______________________).
∴
(______________________).
又∵
(已知),
∴_________________________(等量代换).
∴
(________________________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2b4784ca73e0478d3ae08fd494a8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/b0f7d5cf-72fa-423a-ad93-39cb50c500b4.png?resizew=147)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c613c8ea8b1abe76b803ae12316a8f9.png)
∴_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16acdcaac54dcfe8cc11accda9363987.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴_________________________(等量代换).
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2b4784ca73e0478d3ae08fd494a8f.png)
更新时间:2022-09-11 12:10:58
|
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解答题-问答题
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较易
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【推荐1】如图,直线AB与直线CD相交于点O,OE⊥OF,且OA平分∠COE.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898566606766080/2917694841470976/STEM/95d11363-bb40-4612-89f7-32ca84286ab2.png?resizew=208)
(1)若∠DOE=50°,求∠AOE,∠BOF的度数.
(2)设∠DOE=α,∠BOF=β,请探究α与β的数量关系(要求写出过程).
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(1)若∠DOE=50°,求∠AOE,∠BOF的度数.
(2)设∠DOE=α,∠BOF=β,请探究α与β的数量关系(要求写出过程).
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【推荐2】如图,两直线
、
相交于点
,
平分
,如果
:
:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/1dd9424b-8db7-443c-af03-68ac7de3eb41.png?resizew=195)
(1)求
;
(2)若
,
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![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c3bd2ba80606021f11923df8fe2766.png)
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您最近一年使用:0次
解答题-作图题
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较易
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【推荐1】回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/9f1a6823-a665-43cc-9537-2447c906aaf5.png?resizew=224)
(1)如图,以B为顶点,射线BC为一边,用直尺和圆规作∠CBE,使∠CBE=∠CAD,且BE与AD在AC的同侧(不写作法,只保留作图痕迹);
(2)在所作图中,BE与AD平行吗?为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/9f1a6823-a665-43cc-9537-2447c906aaf5.png?resizew=224)
(1)如图,以B为顶点,射线BC为一边,用直尺和圆规作∠CBE,使∠CBE=∠CAD,且BE与AD在AC的同侧(不写作法,只保留作图痕迹);
(2)在所作图中,BE与AD平行吗?为什么?
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解答题-作图题
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【推荐2】如图,点
在
的边
上,且
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上求作一点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
.(保留作图痕迹,不写作法)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-作图题
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【推荐2】请补全下面的证明.
如图,点
为
的中点,点
为
上的点,
,
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/ea2724c6-41e5-46d6-8414-adf3e6831094.png?resizew=167)
证明:
(已知).
,
(____________________).
( ),
_________
_________(内错角相等,两直角平行)
(____________________).
(已知),
_________
_________(等量代换),
(____________________).
如图,点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b3f839ce88bf970aceb44ab939bd5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/ea2724c6-41e5-46d6-8414-adf3e6831094.png?resizew=167)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e656bb343181eef14d4297b84af5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054a2459fe59969918d5bb1926cd4a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2538c9a732c46dbb11304ac55ed31a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65180e437fd35b55ff5808e8804d9c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
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解答题-问答题
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较易
(0.85)
【推荐1】已知:如图,线
、线
是直线,
,
,
.试说明
.
解:∵
(已知),
∴
_________( ),
∴
(已知),
∴
_________( ),
∵
(已知),
∴
( ),
即
_________,
∴
_________( ),
∴
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c89d1931d1678fbeb6f5066f99d7c4d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc9039f5759f8e555262e1f8c03ef3d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd9eb0048c82bed36d3e2ad96e81194.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55554c9a7e585d139a5460fd1db8f180.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc9039f5759f8e555262e1f8c03ef3d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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解答题-证明题
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【推荐2】如图,点E,C,D,A在同一条直线上,
,
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.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06cd62abe5e301e96111b5060d0c456c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de59390a7059cfdea1f42ce1ffac70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da8fe8f5f8a3f17561d70652ad1172a.png)
您最近一年使用:0次