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Author:
Zhang Guangmin
GeoGebra
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四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
四邊形的特性
GeoGebra笔记功能体验课件
三位數除以一位數（一）
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乘法運算
分蛋糕
褶正三角形
橢圓3--平行四邊形法
題6
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Fractions
Diagrams
Curve Sketching
Centroid or Barycenter
Square