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Author:
Ku, Yin Bon (Albert)
GeoGebra
New Resources
三位數除以一位數（一）
三位數除以一位數（二）
兩位數加法
四邉形 (四年級) 教師版
画直线等分三角形的面积
Discover Resources
内切花瓣
棒形圖(我最喜愛的科目)
線外一點
Sierpinski Triangle
老師講解6
Discover Topics
Multiplication
Limits
Subtraction
Arithmetic Mean
Upper and Lower Sum or Riemann Sum