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翰林數學_2下_CH3-4_扣條
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翰林數學
GeoGebra
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兩位數加法
兩位數除以一位數（一）
畫出對稱圖形
錐體建築師
四邉形 (四年級) 教師版
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过圆上一点作切线，三步
gdss
角的認識
對頂角_2
Reuleaux triangle 掃地機器人v1.0
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Numbers
Special Points
Scatter Plot
Real Numbers
Rectangle