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Author:
lamanleung
GeoGebra
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拼砌四邊形
算柱 (兩位數)
異分母分數減法
三位數除以一位數(二)
四邉形 (四年級) 教師版
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阿基米德(3,8,8)
三角形與邊上一點求正三角形
向量比換面積比
day01_04
中国节灯笼
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Rectangle
Natural Numbers
Circle
Area
Diagrams