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算幾不等式
Author:
顏銓志 ycj
GeoGebra
New Resources
兩位數加法
三位數除以一位數（二）
直角坐標平面上的旋轉變換
畫出對稱圖形
四邊形的特性
Discover Resources
平面幾何
正四面體對邊向量垂直作圖證明
平行四邊形切割
光的反射
Congruent Triangle (SSS)
Discover Topics
Linear Equations
General Quadrilateral
Constructions
Complex Numbers
Tangent Line or Tangent