Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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(四九
[49]
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of 399
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四九
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49
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rhead
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幾何原本 卷一
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">若乙甲丙角、大於戊丁己
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角。</
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丁己之外矣。</
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lb
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戊。</
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