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Author:
Ricky Chan
GeoGebra
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算柱 (兩位數)
兩位數加法
四邉形 (四年級) 教師版
三位數除以一位數（一）
兩位數除以一位數（二）
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waaachen
畢式定理 (11)
平行四邊形
拼出三角形的副本
时钟
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Parametric Curves
Quadratic Equations
Terms
Numbers
Multiplication