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顏色錯覺：灰色的草莓 練習
Author:
学用数学
GeoGebra
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GeoGebra笔记功能体验课件
找出對稱軸
算柱 (兩位數)
四邉形 (四年級) 教師版
異分母分數減法
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Sequence指令練習(逐一套疊正方形)
mario coin
試算表的應用
P6_生趣課_繡曲線_第一課節
翰林數學_2下_CH3-4_大邊對大角
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Bar Chart or Bar Graph
Arithmetic
Natural Numbers
Equilateral Triangles