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錯角---不平行綫
Author:
chanfushun
GeoGebra
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兩位數加法
第八周作业
找出對稱軸
三位數除以一位數（二）
算柱 (兩位數)
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正二十面體
幾何分布 (Geometric Distribution)
三角柱(可側轉、上下轉)
求一數是另一數的幾分之幾？
拼貼11939
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Expected Value
Intersection
Solids or 3D Shapes
Quadrilaterals
Translation