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Author:
bigyen
GeoGebra
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兩位數加法
柱體建築師
找出對稱軸
球体的体积推导（优化版）
球體建築師
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中考压轴题大放送之一
用數值滑桿控製物件顯示條件
Angle between a Line and a Plane
三角波傅立葉級數&有效值
七年级数学平行线间的橡皮筋问题
Discover Topics
Surface
Addition
Parametric Curves
Scalene Triangles
Hypothesis Testing