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Author:
Ricky Chan
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（二）
找出對稱軸
畫出對稱圖形
球体的体积推导（优化版）
Discover Resources
微積分基本定理
Percentage Change 百分改變
中心对称和中心对称图形
包含除法（1 ÷分數）的副本
老師講解8
Discover Topics
Integers
Similarity Transformation or Similarity
Interest Calculation
Random Experiments
Triangles