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周界平移
Author:
Tam Ho Yin
GeoGebra
New Resources
三位數除以一位數（一）
畫出對稱圖形
兩組對邊相等的四邊形
判斷球體
四邉形 (四年級) 教師版
Discover Resources
Addition of 3 Directed Numbers
台球反射
除法
变化的三角形的内心.许兴华数学
以「時」和「分」報時 的複本
Discover Topics
Congruence
Conditional Probability
Scalene Triangles
Statistical Characteristics
Equations