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兩位數除以一位數（一）
【案例】2013年安徽高考15题
算柱 (兩位數)
兩位數加法
找出對稱軸
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直角三角形內切圓半徑
拿破侖定理(外拿破侖)證明一
橢圓2-四圓心近似法
三角函數 週期、振幅變化 課堂投影用
曲線所圍區域的面積 (The Area between Curves)
Discover Topics
Similarity Transformation or Similarity
Expected Value
Rotation
Hyperbola
Linear Equations