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P45第21题
Author:
袁正铎
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
兩位數除以一位數（二）
異分母分數減法
球體建築師
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折扣 例5
數線(小數的認識)
指數函數的圖形
Angle at centre twice angle at circumference
百分數化分數
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Plane Figures or Shapes
Trigonometry
Polynomial Functions
Special Points
Fractions