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30度直角三角形

Author:郭勇

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直角坐標平面上的旋轉變換
異分母分數減法
畫出對稱圖形
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球

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商高定理之正三角形2
分段控制
正方形截痕
quadratic
投擲兩枚硬幣的概率

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Division
Percentages
Root
Sequences and Series
Frequency Distribution

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