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正十二面體內接正四面體或內接正六面體
Author:
侯杰材
GeoGebra
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畫出對稱圖形
找出對稱軸
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
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trigonometry
切割正二十面體(直)
密鋪4
二元一次方程式及其解的意義
固定周界的長方形的面積變化（周界是200厘米）
Discover Topics
Set Theory
Probability
Cone
Expected Value
Normal Distribution