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正十二面體
Author:
侯杰材
正十二面體
GeoGebra
New Resources
Fibonacci Clock
近似值：有效數字
長方體平面投影 (Codex版)
第八周作业
畫出對稱圖形
Discover Resources
向量合成
由線段與弧構成的封閉區域填色
交換律
柱體斜切
俄罗斯方块（第二版）
Discover Topics
Random Variables
Numbers
Quadratic Functions
Similar Triangles
Unit Circle