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陳隆期
GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
錐體建築師
三位數除以一位數（二）
【案例】2013年安徽高考15题
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圆的面积 - 洋葱法
指對數函數交點_1
fastest curve
Ex5D#4
對稱圖形
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Quadratic Functions
Statistical Characteristics
Centroid or Barycenter
Logic
Reflection