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Weighted Mean 加權平均數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
球体的体积推导
畫出對稱圖形
兩位數加法
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
Discover Resources
scalar multiplication
ie 9
reflection of tetrahedron
線性規劃
比例中的定值問題(三)
Discover Topics
Expected Value
Arithmetic
Volume
Surface
Ellipse