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1977北京文5
Author:
常振虎
GeoGebra
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四邊形的特性
GeoGebra笔记功能体验课件
錐體建築師
兩位數除以一位數（一）
柱體建築師
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Equal chords and their distances from the centre
Spotlight 探射燈
教學－面與面的夾角
周界-平移法(教學練習一)
七巧板的副本
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Function Graph
Centroid or Barycenter
Angles
Cuboid
Quadrilaterals