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Author:
Ricky Chan
GeoGebra
New Resources
三位數除以一位數（一）
四邊形的特性
錐體建築師
【案例】2013年安徽高考15题
找出對稱軸
Discover Resources
Dividing a Trapezium
證平行四邊形 (對角相等)
Properties of a Rectangle
變化圖形製作
金惠吉：三维李萨如
Discover Topics
Ellipse
Piecewise Functions
Fractal Geometry
Poisson Distribution
Linear Programming or Linear Optimization