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三角形數
Author:
LAI Wing Yan
GeoGebra
New Resources
兩位數除以一位數（一）
斜率的值
球体的体积推导
兩位數加法
空间中两直线的位置关系
Discover Resources
圓形與相似形
表示數線上的位置
複合不平等
Ambiguous Cylinder Illusion
巧算周界
Discover Topics
Frequency Distribution
Arithmetic Operations
Surface
Square
Polygons