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切割正四面體
Author:
薛鈞聰
GeoGebra
New Resources
異分母分數減法
判斷球體
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
畫出對稱圖形
Discover Resources
平移旋轉
坐标变换
Trapezoid1
基础知识
例题2（P点可拖动）
Discover Topics
Root
Set Theory
Kite
Surface
General Quadrilateral