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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
四邉形 (四年級) 教師版
柱體建築師
找出對稱軸
兩組對邊相等的四邊形
異分母分數減法
Discover Resources
三度空間中的長方體
linkage
参数曲线
Time
畫三角形 題1d 的複本
Discover Topics
Kite
Pie Chart or Circle Chart
Square
Line Segment
Quadratic Functions