如图,在
中,
的平分线
交
于点
,过点
作
交
于点
,过点
作
交
于点
.
![](https://img.xkw.com/dksih/QBM/2023/1/10/3150027441848320/3154032069771264/STEM/a326bfcded244fff8d0f4ec84f4e5769.png?resizew=129)
(1)求证:
是
的平分线;
(2)若
,若
, 求
的度数.
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2612c3ed33135b60b5a08c173c9f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/1/10/3150027441848320/3154032069771264/STEM/a326bfcded244fff8d0f4ec84f4e5769.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac20cb1f6d54ce3aabd35cadb0b6b793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514d6a0ab159cd1305783a0999ce17b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
更新时间:2023-01-16 13:57:35
|
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解答题-问答题
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适中
(0.65)
名校
【推荐1】(1)已知,
分别是
和
的平分线.
①如图1,若与
互为补角,直接写出
的度数 ;
②如图2,是
内部的一条射线,若
,
,求
的度数;
(2)如图3,,
,若
,求
的度数.
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解答题-问答题
|
适中
(0.65)
【推荐2】如图所示,OM平分∠BOC,ON平分∠AOC,
(1)若∠AOB=90°,∠AOC=30°,求∠MON的度数;
(2)若(1)中改成∠AOB=60°,其他条件不变,求∠MON的度数;
(3)若(1)中改成∠AOC=60°,其他条件不变,求∠MON的度数;
(4)从上面结果中看出有什么规律?
(1)若∠AOB=90°,∠AOC=30°,求∠MON的度数;
(2)若(1)中改成∠AOB=60°,其他条件不变,求∠MON的度数;
(3)若(1)中改成∠AOC=60°,其他条件不变,求∠MON的度数;
(4)从上面结果中看出有什么规律?
![](https://img.xkw.com/dksih/QBM/2018/12/27/2106078338727936/2108219104698368/STEM/82142ee50c0d4ae59dd28a0c4d8352dc.png?resizew=100)
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解答题-证明题
|
适中
(0.65)
【推荐1】 如图,在凸四边形
中,
,
平分
,
平分
.
,求
的度数.
(2)判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e81b1b9606ad25244ff82c8292df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec69d43f611d65d9b0dc642a83f12ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-问答题
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适中
(0.65)
【推荐2】问题呈现:下面是小明复习全等三角形时遇到的一个问题并引发的思考,请仔细阅读,并帮助小明完成以下学习任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9874f3a0-d142-439a-bed5-237864ca711f.png?resizew=354)
如图①,OC平分
,点P在OC上,M、N分别是OA,OB上的点,
,PM与PN相等吗?请说明理由.
小明的思路:要说明
,只需说明
即可.
以下是小明解决问题的过程:
解:
,理由如下:
因为OC平分
,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f18cef1745d84a0265246684753bd.png)
又因为
,
,所以
,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
任务:
(1)小明得到
的依据是______.(填序号)
①SSS ②SAS ③AAS ④ASA
(2)如图②,在四边形ABCD中,
,
的平分线和
的平分线交于CD边上点P,P是CD边的中点吗?请说明理由.
(3)在(2)的条件下,图②中AD与BC平行吗?请说明理由
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9874f3a0-d142-439a-bed5-237864ca711f.png?resizew=354)
如图①,OC平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
小明的思路:要说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b18ad09fa02b32cc9d5087a74ccb1f9.png)
以下是小明解决问题的过程:
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
因为OC平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f18cef1745d84a0265246684753bd.png)
又因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ce5cddb3791c46d6ef0c32d35a7886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12eac87e5a5cde9402b381a61d1966f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
任务:
(1)小明得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12eac87e5a5cde9402b381a61d1966f.png)
①SSS ②SAS ③AAS ④ASA
(2)如图②,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609ada36dd56b33279103ebc1f90bbac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(3)在(2)的条件下,图②中AD与BC平行吗?请说明理由
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