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张书真
GeoGebra
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兩位數加法
四邊形的特性
錐體建築師
拼砌四邊形
四邉形 (四年級) 教師版
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hihi
進入拋面的平行光會反射至焦點
新型軌跡
squence
滚动的四面体
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Parametric Curves
Logic
Rhombus
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Correlation