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翰林數學_2下_CH4-1_平行線的特性與定義
Author:
翰林數學
GeoGebra
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球体的体积推导（优化版）
找出對稱軸
算柱 (兩位數)
兩位數除以一位數（一）
錐體建築師
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test2fhms
圍周
五角星动画
展開圓面積 (講義版)的副本
四邉形 (四年級) 教師版
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Complex Numbers
Reflection
Stochastic Process or Random Process
LCM and GCD
Hypergeometric Distribution