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Author:
ins_junyi
GeoGebra
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算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
錐體建築師
異分母分數減法
兩位數除以一位數（二）
Discover Resources
Triangle fixed height
黎曼和
尺規作圖乾淨版
Question 4
凸透镜成像
Discover Topics
Surface
Sphere
Symmetry
Reflection
Conic Sections