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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
讀磅
球体的体积推导
兩位數加法
直線的斜率
三位數除以一位數（二）
Discover Resources
Polygonal numbers
proof3(1-1)吳奕杰
Calculus
雙曲線2--焦點法
Copia de Fractal Spirograph (Fractal Roulette)
Discover Topics
Distributions
Curve Sketching
Vectors 3D (Three-Dimensional)
Binomial Distribution
Upper and Lower Sum or Riemann Sum