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Estimating Mean 猜猜平均數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
畫出對稱圖形
兩組對邊相等和有直角的四邊形
異分母分數減法
兩位數除以一位數（二）
判斷球體
Discover Resources
公切線長度的計算
Quiz on Rotation 旋轉變換：測驗
奈格爾點
德·拉·希尔(de la hier)定理
中位线的副本
Discover Topics
Perimeter
Real Numbers
Triangles
Statistical Characteristics
Natural Numbers