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Author:
Anthony OR 柯志明
GeoGebra
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異分母分數減法
兩位數除以一位數（二）
拼砌四邊形
判斷球體
球体的体积推导（优化版）
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cvcvxcvxcvxcv
正弦定理
時鐘
Copy of 正立方體中的正四面體
洋葱初中数学
Discover Topics
Square
Tangent Line or Tangent
Right Triangles
Rhombus
Limits