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Triangular Number 三角形數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
三位數除以一位數（二）
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
判斷球體
Discover Resources
北區模考多選第八題 (2014.03.06)
推移畢氏
七巧板
面積 題目4
函数作图工具的副本
Discover Topics
Optimization Problems
Pie Chart or Circle Chart
Differential Calculus
Inequalities
Incircle or Inscribed Circle