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4 янв 2000 г. до нашей эры - 前2000年,埃及人发明十进制,整数和分数计算法,三角形和圆面积计算法,正方角锥体和锥台体积计算法;发明防腐剂以保存木乃伊
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4 янв 2000 г. до нашей эры
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