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Author:
李春培
GeoGebra
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兩位數加法
拼砌四邊形
兩位數除以一位數（一）
球体的体积推导（优化版）
異分母分數減法
Discover Resources
拋物線頂點軌跡圖
判斷柱體 4
圓的展開partI
圓的平移
兩位數除法
Discover Topics
Equilateral Triangles
Limits
Intersection
Set Theory
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