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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
球体的体积推导
異分母分數減法
判斷球體
三位數除以一位數（二）
柱體建築師
Discover Resources
圓周 (圖形E)
Physics
k126各國基地
密鋪圖形
十字相乘法因式分解
Discover Topics
Ellipse
Vectors 3D (Three-Dimensional)
Division
Quadratic Equations
Cone