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20200108中线倍长大法
Author:
陈敦莹
GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
判斷球體
近似值：有效數字
柱體建築師
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ghrtghrtghrtgbr
If指令的應用1
第二次:20190110
比一比看谁大
三阶魔方（magic cube）
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Cuboid
Constructions
Derivative
Plane Figures or Shapes
Histogram