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畢氏定理完成20170330
Author:
許志昌
GeoGebra
New Resources
第八周作业
判斷球體
四邉形 (四年級) 教師版
兩位數除以一位數（二）
三位數除以一位數（二）
Discover Resources
點光源圖
圍周
fastest curve
No.2
比較數量-1
Discover Topics
Rational Numbers
Addition
Incircle or Inscribed Circle
Equilateral Triangles
Combinatorics