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Author:
cktsang
permutation (chi. ver.)
GeoGebra
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畫出對稱圖形
四邉形 (四年級) 教師版
三位數除以一位數（一）
球体的体积推导
三位數除以一位數（二）
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圓的性質
Drawing quadrilaterals on the grid or the pinboard
不規則圖形的周界(F)
ABC 2
椭圆的定义
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Sine
Arithmetic Mean
Equations
Calculus
Scatter Plot