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Author:
Fong Sir
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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
找出對稱軸
GeoGebra笔记功能体验课件
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商高定理之新月形
分數認識
Copy of 賺賠：例1
外心
分数减法 Fraction Subtraction
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Special Points
Subtraction
Area
Conditional Probability
Incircle or Inscribed Circle