如图,已知
平分
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/51f43786-152f-4b2c-b041-4647c75a6f23.png?resizew=222)
(1)求证:
.
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/51f43786-152f-4b2c-b041-4647c75a6f23.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cad7b03f934718b18ce34cdf0b85863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12397170005d7552a5402c94cd2b966a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
更新时间:2023-04-20 11:44:18
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【推荐2】如图,OB是∠AOC的平分线,OD是∠COE的平分线,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/85fd849b-a1b7-40ed-a25a-48b507554205.png?resizew=244)
(1)若
,求∠BOE的度数;
(2)若∠AOD与∠BOD的和是180°,求∠AOC的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6bb0bae748b35db0532f29077ec567.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/85fd849b-a1b7-40ed-a25a-48b507554205.png?resizew=244)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bd03c25d9da014168d833970ba6ea8.png)
(2)若∠AOD与∠BOD的和是180°,求∠AOC的度数.
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解答题-证明题
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【推荐1】已知:如图,点D是
上任意一点,
,交
的延长线于点E,
,垂足为点F,求证:
.
证明:∵
,
∴
( ),
∵
,
∴
,
∴
( ),
∴
( ),
∴
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1ba8964edcc9d277c5570bb1eb03da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68357ac2e91c2a2ad72ee1b16b631b7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce38d8a8a7043586aad206f8153d0bc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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【推荐2】如图,直线
、
、
相交于点O,且
,
平分
,若
,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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcba29d5adaf51d83f1ed5b713ccef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5872ef44ce364d04622e28e1d6f9e39f.png)
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234824631197696/3258302907334656/STEM/3c510a5eb0be4013bb89e8d425b68932.png?resizew=242)
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【推荐1】填充证明过程和理由:
已知:如图,
,
,
平分
,求证:
.
证明:
(已知),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(___________).
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
(已知),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(___________).
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
平分
(已知),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(___________),
___________(___________),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(___________).
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402ab8c49c4dd2aaa0ef47164c7cac00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b85c1d3d1b63519a0cbfe6ddcbcdf22.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402ab8c49c4dd2aaa0ef47164c7cac00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d67aa2a39c15abaa0cbc09432f1fb.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e26895bd023fc7f392b30cf7d05511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b85c1d3d1b63519a0cbfe6ddcbcdf22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/d9ff7207-5b61-4544-8334-d447d286290a.png?resizew=205)
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【推荐2】如图,已知:EB∥DC,∠A=∠ADE,你认为∠C和∠E相等吗?为什么?
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399530913685504/2399769531744256/STEM/635b9e60fa2145f2af66afe947e66837.png?resizew=121)
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【推荐3】已知:如图,请分别依据所给出的条件,判定相应的哪两条直线平行?并写出推理的根据.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/25/b0d16053-bbd1-4342-a0f9-8dbbeb67f87f.png?resizew=183)
(1)如果∠2=∠3,那么____________.(____________,____________)
(2)如果∠2=∠5,那么____________.(____________,____________)
(3)如果∠2+∠1=180°,那么____________.(____________,____________)
(4)如果∠5=∠3,那么____________.(____________,____________)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/25/b0d16053-bbd1-4342-a0f9-8dbbeb67f87f.png?resizew=183)
(1)如果∠2=∠3,那么____________.(____________,____________)
(2)如果∠2=∠5,那么____________.(____________,____________)
(3)如果∠2+∠1=180°,那么____________.(____________,____________)
(4)如果∠5=∠3,那么____________.(____________,____________)
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【推荐1】如图,直线
,直线
交a,b于点A,B,
的平分线交直线b于点C.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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【推荐2】已知
,
, 点P在直线
上, E为
上一点, F为
上一点.
上运动时,连接
,求
的值;
(2)如图②, 当点 P在线段
延长线上运动时,连接
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc9c9a1c828f5b3c718e2a98a749192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6d8e0cd2e7f49b4d50afab17d29b8f.png)
(2)如图②, 当点 P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/067a053ff81ee7e5401e5b5db10880bb.png)
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