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S8G5 消失的小方格(練習)
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学用数学
GeoGebra
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球体的体积推导（优化版）
畫出對稱圖形
異分母分數減法
球體建築師
【案例】圆柱体内放置一个大球六个小球
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參加校際數學比賽的同學的分數
地球20160328
堆朵
P.4對稱
分苹果除法
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Combinatorics
Conic Sections
Linear Equations
Parallelogram
Differential Equation