已知:如图,在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8817d064ddf1f1809e391d47c4e1ab04.png)
(1)作
的平分线
,交
于点
;作
的中点
(要求:尺规作图,保留作图痕迹,不必写作法和证明);
(2)连接
,则
________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8817d064ddf1f1809e391d47c4e1ab04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/9148e6f5-42eb-4143-baf6-6921ef162168.png?resizew=168)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7cbe31f9c11d236c7c9611f207f465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
更新时间:2024-01-06 19:50:54
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解答题-问答题
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适中
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【推荐2】若三角形的三个内角的比是1:2:3,最短边长为1,最长边长为2.求:(1)这个三角形各内角的度数; (2)另外一条边长的平方.
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解答题-证明题
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适中
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【推荐1】如图,已知△ABC中,∠BAC=90°,AB=AC.D为线段AC上任一点,连接BD,过C点作
且AD=CE,试说明BD和AE之间的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/e143d0b2-8af9-43e9-a6eb-982b5ee80074.png?resizew=177)
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解答题-证明题
|
适中
(0.65)
【推荐2】在
中,
,
,
是
的角平分线,
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/4fa066e3-1db4-4beb-9e5c-a4135cc8c41d.png?resizew=108)
(1)如下图,点
为
上一点,连接
,作等边
,连接
,求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/65530c9e-c827-4532-8fb0-734383fb1c9b.png?resizew=120)
(2)如下图,点
为线段
上一点,连接
,作
,
交
延长线于
,探究线段
,
与
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/4fa066e3-1db4-4beb-9e5c-a4135cc8c41d.png?resizew=108)
(1)如下图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2aaedbf1cf36f04ade42e232879f69.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/65530c9e-c827-4532-8fb0-734383fb1c9b.png?resizew=120)
(2)如下图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfef3ec8b8ef7d2b4e93aeb3bf2df0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/9f05df16-7a85-49e2-bc24-60bf7d4f0e62.png?resizew=151)
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,在四边形ABCD中,∠B=∠ADC=69°,∠BCD=96°,连接AC.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896870043295744/2935898799276032/STEM/73472a6c-02e7-42c6-bc06-e0f3595b47cc.png?resizew=261)
(1)尺规作图:按下列要求作图,不写做法,要保留作图痕迹,并标明字母.
①作∠BAC的角平分线与BC交于点E;
②连接DE.
(2)在(1)的条件下,若AC=AD,请完成:
①求∠AEB的度数;
②求证:BC=ED.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896870043295744/2935898799276032/STEM/73472a6c-02e7-42c6-bc06-e0f3595b47cc.png?resizew=261)
(1)尺规作图:按下列要求作图,不写做法,要保留作图痕迹,并标明字母.
①作∠BAC的角平分线与BC交于点E;
②连接DE.
(2)在(1)的条件下,若AC=AD,请完成:
①求∠AEB的度数;
②求证:BC=ED.
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解答题-作图题
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适中
(0.65)
【推荐2】如图,已知∠AOB,用两种不同的方法作∠AOB的平分线.
要求:(1)用直尺和圆规作图;(2)保留作图痕迹,写出必要的文字说明.
要求:(1)用直尺和圆规作图;(2)保留作图痕迹,写出必要的文字说明.
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850642736906240/2851739512856576/STEM/bcd22ccf-8a1a-494a-86a1-5d7373afffc7.png?resizew=193)
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解答题-作图题
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适中
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【推荐3】请按要求完成下面三道小题.
(1)如图1,∠BAC关于某条直线对称吗?如果是,请画出对称轴尺规作图,保留作图痕迹;如果不是,请说明理由.
(2)如图2,已知线段AB和点C(A与C是对称点).求作线段,使它与AB成轴对称,标明对称轴b,操作如下:
①连接AC;
②作线段AC的垂直平分线,即为对称轴b;
③作点B关于直线b的对称点D;
④连接CD即为所求.
(3)如图3,任意位置的两条线段AB,CD,且AB=CD(A与C是对称点).你能通过对其中一条线段作有限次的轴对称使它们重合吗?如果能,请描述操作方法或画出对称轴(尺规作图,保留作图痕迹);如果不能,请说明理由.
(1)如图1,∠BAC关于某条直线对称吗?如果是,请画出对称轴尺规作图,保留作图痕迹;如果不是,请说明理由.
(2)如图2,已知线段AB和点C(A与C是对称点).求作线段,使它与AB成轴对称,标明对称轴b,操作如下:
①连接AC;
②作线段AC的垂直平分线,即为对称轴b;
③作点B关于直线b的对称点D;
④连接CD即为所求.
(3)如图3,任意位置的两条线段AB,CD,且AB=CD(A与C是对称点).你能通过对其中一条线段作有限次的轴对称使它们重合吗?如果能,请描述操作方法或画出对称轴(尺规作图,保留作图痕迹);如果不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/1/6/2371012503363584/2371428117889024/STEM/01b63d34355c4a6a9acfcf12b8c0c089.png?resizew=451)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,
,
是
的角平分线,
交于点F.
![](https://img.xkw.com/dksih/QBM/2022/12/14/3130740451573760/3142037611036672/EXPLANATION/22564cb4561e40debbd93f79c6bf7b79.png?resizew=186)
(1)求
的度数;
(2)判断
与
之间的数量关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c785bce57b8ce113b28e8f16fc2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c785bce57b8ce113b28e8f16fc2c1.png)
![](https://img.xkw.com/dksih/QBM/2022/12/14/3130740451573760/3142037611036672/EXPLANATION/22564cb4561e40debbd93f79c6bf7b79.png?resizew=186)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
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名校
【推荐2】如图,
的角平分线
、
相交于点
,
的延长线和
的外接圆相交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262a173a7cf68e06b4be175df69e2b74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/6c7ace7b-7f66-4af1-b961-d8a9b007cf70.png?resizew=130)
您最近一年使用:0次