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Author:
詠甯
GeoGebra
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四邊形的特性
異分母分數減法
直角坐標平面上的旋轉變換
錐體建築師
【案例】2013年安徽高考15题
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Perigal's Dissection
加減併式與估算
All in one (centres of triangle)
定周长的正多边形面积变化规律（含圆）
变化的幂函数.许兴华数学
Discover Topics
Upper and Lower Sum or Riemann Sum
Ratios
Power Functions
Inequalities
Surface