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tan90t
GeoGebra
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拼砌四邊形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
異分母分數減法
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thm 11,12
GeoGebra在數學教學上的應用(彰化師範大學數學系)
维纳斯的身高 （简易版）
（三）观察物体
翰林數學_2下_CH4-2_平行四邊形性質
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Inequalities
Incircle or Inscribed Circle
Cone
Rotation
Line Segment