阅读理解:
如图1.已知:
,点
是直线
、
之间的一点,点
、
分别在直线
、
上,则可推出
.
小明的思路是:过点
作
,通过平行线的性质可得结论
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/c7da0150-b783-4556-b377-f36f1ac4c721.png?resizew=342)
(1)请根据小明的思路,写出完整的推理过程;
(2)利用(1)中的结论解决问题:
如图2.已知:
,点
是直线
、
之间的一点,点
、
分别在直线
、
上,
是
的平分线.
是
的平分线,
,
.
①若
,求
的度数;
②试探究
与
之间的数量关系.
如图1.已知:
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/fbc7e50cd136da91980244e59f4029ee.png)
小明的思路是:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a933d7d5f7accb3e6052c9c74df494a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7e50cd136da91980244e59f4029ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/c7da0150-b783-4556-b377-f36f1ac4c721.png?resizew=342)
(1)请根据小明的思路,写出完整的推理过程;
(2)利用(1)中的结论解决问题:
如图2.已知:
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431bd1ab475f5c7936a3b45b317abe99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d8383cd1cf1c68fb2ce8f53b403bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0f2809abcdefe115f74933752c95f1.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9396b28f53c6b10be91ae24bf18bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b89403a4db68423b83136d2cbff6225.png)
②试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6a524bfcc66c014c632b36424cd0e.png)
更新时间:2022-07-17 12:29:58
|
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解答题-问答题
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适中
(0.65)
【推荐1】如图,点
是直线
上一点,以
为顶点作
,且
、
位于直线
两侧,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/24ddd31d-ecb8-4ebf-85e2-3db8b3db621c.png?resizew=162)
(1)当
时,求
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(2)请你猜想
和
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c3bd2ba80606021f11923df8fe2766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)请你猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
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【推荐2】如图所示,已知直线AB、CD相交于点O,OE、OF为射线,∠AOE=90°,OF平分∠AOC,∠AOF+∠BOD=57°,求∠EOD的度数
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解答题-证明题
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适中
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名校
【推荐1】完成下列推理填空:
如图,已知
,MP平分
,NQ平分
.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79c404258e291cc0559f301ad860b56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/656c4de2-2753-44eb-a3be-b24099ce8ebb.png?resizew=234)
证明:∵
(已知)
∴
(___________)
∵MP平分
,NQ平分
(已知)
∴
_________(角平分线的定义)
∴
(____________)
∴
(___________)
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a13b7c0e1c488447dfa0b234991e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79c404258e291cc0559f301ad860b56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/656c4de2-2753-44eb-a3be-b24099ce8ebb.png?resizew=234)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe3d000b3bbb0387062d208dbf85d1fd.png)
∵MP平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a13b7c0e1c488447dfa0b234991e31.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88fc4b0edc398d8607d305672bb3058.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79c404258e291cc0559f301ad860b56.png)
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【推荐2】如图1,
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上,反射光线为
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与
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镜上有一光源 P, 发射的光线交反射光线
于点Q, 若
,猜想
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eac80dae1832bb661ab02660fc92ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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解答题-证明题
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【推荐2】(1)若一个多边形的外角和比它的内角和的
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-问答题
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名校
解题方法
【推荐3】探究一:我们知道,三角形的一个外角等于与它不相邻的两个内角的和.那么,三角形的一个内角与它不相邻的两个外角的和之间存在何种数量关系呢?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/3dafb700-7c78-451e-bebb-2dbe308c64ad.png?resizew=347)
(1)已知:如图1,∠FDC与∠ECD分别为△ADC的两个外角,试探究∠A与∠FDC+∠ECD的数量关系.
探究二:三角形的一个内角与另两个内角的平分线所夹的钝角之间有何种关系?
(2)已知:如图2,△ADC中,DP、CP分别平分∠ADC和∠ACD,试探究∠P与∠A的数量关系.
探究三:若将△ADC改为任意四边形ABCD呢?
(3)已知:如图3,在四边形ABCD中,DP、CP分别平分∠ADC和∠BCD,试利用上述结论探究∠P与∠A+∠B的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/3dafb700-7c78-451e-bebb-2dbe308c64ad.png?resizew=347)
(1)已知:如图1,∠FDC与∠ECD分别为△ADC的两个外角,试探究∠A与∠FDC+∠ECD的数量关系.
探究二:三角形的一个内角与另两个内角的平分线所夹的钝角之间有何种关系?
(2)已知:如图2,△ADC中,DP、CP分别平分∠ADC和∠ACD,试探究∠P与∠A的数量关系.
探究三:若将△ADC改为任意四边形ABCD呢?
(3)已知:如图3,在四边形ABCD中,DP、CP分别平分∠ADC和∠BCD,试利用上述结论探究∠P与∠A+∠B的数量关系.
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