所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:05 – basic idea 基本概念 01:10 – illustrative example 1 例子1 02:06 – illustrative example 2 例子2 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:05 – why rationalization of denominator 為何需要有理化分母 01:54 – basic idea 基本概念 03:57 – illustrative example 1 例子1 05:05 – illustrative example 2 例子2 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:05 – properties of surds 根式的特性 01:52 – illustrative example 1 例子1 03:39 – illustrative example 2 例子2 05:33 – illustrative example 3 例子3 06:05 – simplification of surds 根式化簡 07:45 – illustrative example 4 例子4 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:05 – review of different types of numbers 重溫不同類型的數字 01:07 – definition of rational numbers 有理數的定義 02:20 – definition of irrational numbers 無理數的定義 03:51 – proof of irrationality of square root of 2 證明開方2為無理數 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:05 – what is square root 甚麼是平方根 01:04 – radical sign 根號 01:36 – negative square roots 負平方根 02:28 – square root of zero and negative numbers 零及負數的平方根 04:21 – what is surd 甚麼是根式 06:28 – brief estimation of values of square roots 粗略估算平方根的數值 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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影片內容: 00:55 – discovery of irrational numbers 無理數的發現 所屬主題: [初中數學] – Rational and Irrational Numbers 有理數及無理數

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