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Author:
李春培
happy birthday
GeoGebra
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兩位數加法
找出對稱軸
四邊形的特性
【案例】圆柱体内放置一个大球六个小球
【案例】2018年全国1卷理科12题
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畢氏定理完成20170330
題二
拋物線1-焦點法
圆锥曲线的产生
正三角形在长方形边上移动加滚动
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Fractal Geometry
Median Value
Ellipse
Vectors 2D (Two-Dimensional)
Similar Triangles