如图,AB
CD,点G、F分别在AB、CD上,FE平分∠GFD,交AB于点E,且∠EGF=50°.求∠BEF的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/56f8ddcb-bdb1-4135-a845-5a9ea055cc94.png?resizew=237)
更新时间:2021-08-22 21:19:47
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解答题-问答题
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适中
(0.65)
【推荐1】在
中,
的平分线与
的平分线交于点D.
(1)如图1,过点D作直线
,分别交
和
于点M和N,求
的度数(用含
的式子表示).
(2)如图2,当过点D的直线
与
的交点仍在线段
上,而与
的交点在
的延长线上时,
,
,
三者之间存在怎样的数量关系?说明你的理由.
(3)如图3,当过点D的直线
与
的交点在线段
的延长线上,而与
的交点在线段
上时,(2)中
,
,
三者之间的数量关系是否仍然成立?若成立,请说明你的理由;若不成立,请给出
,
,
三者之间的数量关系,并说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/1a7136dd-c5d5-4435-a9cf-1d2884986aa3.jpg?resizew=431)
(1)如图1,过点D作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883a5d77b98be061b22a23a2f1ffc696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)如图2,当过点D的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e265894011c2b93ce5a5fa9fab2b9982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e47a4679cace57ffd2b870f5b13a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)如图3,当过点D的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e265894011c2b93ce5a5fa9fab2b9982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e47a4679cace57ffd2b870f5b13a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e265894011c2b93ce5a5fa9fab2b9982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e47a4679cace57ffd2b870f5b13a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】已知:如图1,在四边形
中,
是四边形
的外角.若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96128255fefba0cd356cf9562588f148.png)
,则
;
②试说明
的度数与
,
的数量关系.
(2)直线
,
分别经点B,D,且
,
分别平分
,
①如图2,若
,试探究
与
的数量关系,并说明理由;
②若
与
相交于点M,
,
,求
与
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ea4974600fc5935102b7650d050352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96128255fefba0cd356cf9562588f148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be66a4dad3eda57de0458eec62752245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22dbb2cee33925adf34543ae5e782b7.png)
②试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c2641410395c841be7a615feb3cee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ea4974600fc5935102b7650d050352.png)
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e03566282ef39ad17821036f228174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b232ce4cd226c14597b8d43ea5e0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d0132234338f2d3ce87a1aea0fd7beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知AB∥CF,DE∥CF,DE与BC交于点P,若∠ABC=70°,∠CDE=130°.
(1)试判断∠ABP与∠BPD之间的数量关系,并说明理由;
(2)求∠BCD的度数.
(1)试判断∠ABP与∠BPD之间的数量关系,并说明理由;
(2)求∠BCD的度数.
![](https://img.xkw.com/dksih/QBM/2019/2/16/2141748388282368/2142788740120576/STEM/46f5eb600d684b21a46964e5c25268b8.png?resizew=114)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四边形
是平行四边形,点E在边
上,点F在边
上,
.
(1)如图1,若
,求
;
(2)如图2,若点E平分
,连接
,过点A作
的平行线交
于点G,连接
.
交
于点H,
交
于点I.
①求证:
;
②求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f5af7cdf388a47357c119f42140f9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/f1f3a48a-1b1a-4c8d-8e24-56cbe3bb7f6b.png?resizew=527)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38ca8280477466158ce27ebf41ab78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
(2)如图2,若点E平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da23d5f7615bb735edb2022d13f887f0.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03363841611fa01a1b3e962499d89e91.png)
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