布の稠密なること及等分の可能○倍加及等分,最小公倍數及最大公約數○分數の比,比例式,分數の乘法,除法
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一七四-二五三
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最小公倍數及最大公約數○冪の定義の擴張,負の指數○素數分解の應用○分數を部分的分數に分解すること○與へられたる分母を有する旣約眞分數の數,ガウスの函數 ,其性質及算式○分數の展開,命數法,小數○循環小數の起源○フエルマーの定理の間接證明○小數の四則演算
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二五三-二八一
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有理數,算法の形式上不易,問題の說明○順及逆の算法,其關係○減法の汎通及負數,正負整數の乘法○除法の汎通と分數,有理數四則,除法の例外○有理數の大小
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二八一-三二二
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具體の量,抽象の量○量の原則,量の比較,加合及連續○「有理區域」,其性質,量の