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20180412 同分母分數加法
Author:
makkei
GeoGebra
New Resources
球體建築師
找出對稱軸
直角坐標平面上的旋轉變換
長方體平面投影 (Codex版)
Earth with coastline
Discover Resources
equilateral triangle construction
圓形墊圈 (Washer)
分段函數
櫻花鉤吻鮭
閱讀月曆（綜合版）
Discover Topics
Scalene Triangles
Binomial Distribution
Stochastic Process or Random Process
Special Points
Rotation