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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
Nested spiral octagon
四邊形的特性
兩組對邊相等的四邊形
判斷球體
美國國旗 (Claude 版)
Discover Resources
陽明高中研習
練習
雜思
面积
圆在折线上滚动
Discover Topics
Vectors 3D (Three-Dimensional)
Triangles
Complex Numbers
Cube
Similar Triangles