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有向數的加法
Author:
Methew Mau
GeoGebra
New Resources
兩位數除以一位數（二）
兩位數加法
兩組對邊相等的四邊形
錐體建築師
畫出對稱圖形
Discover Resources
圓柱截痕
乘法運算
单位圆画三角函数图像
congruent triangles
相机快门模拟
Discover Topics
Centroid or Barycenter
Set Theory
Sphere
Circle
Distributions