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钟表制作成功啦
Author:
辛贺华
GeoGebra
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球体的体积推导
兩位數加法
異分母分數減法
兩位數除以一位數（一）
柱體建築師
Discover Resources
Brahmagupta 四邊形的構造方法
奠基
三角形的底和高
圓與切線
撒针估算面积实验
Discover Topics
Geometric Transformations
Natural Numbers
Addition
Diagrams
Expected Value