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1 . 《几何原本》中的几何代数法是以几何方法研究代数问题,这种方法是后西方数学家处理问题的重要依据,通过这一原理很多的代数公理或定理都能够通过图形实现证明,也称之为无字证明,现有图形如图所示,
为线段
上的点,且
为
的中点,以
为直径作半圆,过点
作
的垂线交半圆于
,连结
,过点
作
的垂线,垂足为
,若不添加辅助线,则该图形可以完成的所有无字证明为_________ .(填写序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/515a8637-30c5-4728-85f4-0240e20f3913.png?resizew=161)
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7009eee373cc98ef7c8243901ec83037.png)
③
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ff0b118e5145f94c90c975e1fb74ff.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/c5db41a1f31d6baee7c69990811edb9f.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/b20740df2f6ae49f8dc88d2449897f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/515a8637-30c5-4728-85f4-0240e20f3913.png?resizew=161)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f4d4e4d991871f2f35309b1604c9fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7009eee373cc98ef7c8243901ec83037.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8378bcf7139202d78b706b726602caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39dce2a6f257ad000947a4261da9783.png)
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2023-02-02更新
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477次组卷
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5卷引用:黑龙江省哈尔滨市第九中学校2024届高三上学期开学考试数学试题
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2 . 用反证法证明“一个三角形至少有两个锐角”,则反设是__________ .
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