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Author:
johnmayhk
GeoGebra
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異分母分數減法
三位數除以一位數（一）
錐體建築師
画直线等分三角形的面积
兩組對邊相等的四邊形
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Rectangle _03
轉動的水箱
摺紙1
x to 1/5 Integration
畢氏定理
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Division
Rotation
Coordinates
Incircle or Inscribed Circle
Definite Integral