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生日悖論
Author:
李春培
生日悖論
GeoGebra
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四邉形 (四年級) 教師版
算柱 (兩位數)
異分母分數減法
錐體建築師
四邊形的特性
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淮阴2015-28
angles sum of a triangle 1
規律物件集的製作
平行四邊形面積
保持比例
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Trigonometry
Solids or 3D Shapes
Linear Regression
Random Experiments
Optimization Problems