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菱形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79847
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩位數除以一位數（二）
四邊形的特性
算柱 (兩位數)
拼砌四邊形
Discover Resources
高中二年級平面向量
方向導數 (Directional Derivative)
康軒5下-第2單元-體積-P27
圖D
正方形分割
Discover Topics
Surface
Arithmetic Operations
Arithmetic Mean
Circumcircle or Circumscribed Circle
Equilateral Triangles