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猜猜平均數（限時版）
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
兩位數除以一位數（二）
畫出對稱圖形
拼砌四邊形
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
可變大的圓桌
時間參數跳躍函數與向量搭配
Homework1
七巧板
Rotational Symmetry的副本
Discover Topics
Linear Functions
Similar Triangles
Division
Cylinder
Fractions