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平行四邊形與三角形
Author:
李春培
Topic:
Area
平行四邊形與三角形
GeoGebra
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兩位數除以一位數（一）
四邉形 (四年級) 教師版
算柱 (兩位數)
畫出對稱圖形
兩位數除以一位數（二）
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P2 math
根號n的做圖法之二
黎曼和
tetrahedron rotational symmetric
任務1的副本
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Geometric Transformations
Geometry
Cone
Tree Diagrams
Mathematics