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圓內接四邊形任務二：提示一
Author:
Stanley Mak
GeoGebra
New Resources
找出對稱軸
判斷球體
異分母分數減法
柱體建築師
算柱 (兩位數)
Discover Resources
下和與上和
畢式定理 (03)
立方體截痕
畢氏定理證明（Ｉ）
P4_四下_面積（一）(教師版)
Discover Topics
Logic
Arithmetic Operations
Arithmetic Mean
Upper and Lower Sum or Riemann Sum
Sphere