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Pentacle
Author:
Jianqiang He
GeoGebra
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兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
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數字棋盤
Clock24hour
史坦納圓 (Steiner Circle)
相似形_Tasks_Collection
垂心
Discover Topics
Polynomial Functions
Parametric Curves
Conditional Probability
Secant Line or Secant
Numbers