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天干與地支
Author:
李春培
GeoGebra
New Resources
三位數除以一位數（二）
找出對稱軸
畫出對稱圖形
四邉形 (四年級) 教師版
第八周作业
Discover Resources
模擬隨機變數的「總和」
兩圓內外公切線
Dart Board
Copy of 劉徽的「割圓術」
翰林數學_2下_CH4-1_截線與截角的意義
Discover Topics
Vectors 2D (Two-Dimensional)
Differential Calculus
Angles
Arithmetic Mean
Circumcircle or Circumscribed Circle