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三角形面積
Author:
lkkbmaths teachers 檔案儲存用
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GeoGebra
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三位數除以一位數（二）
錐體建築師
柱體建築師
GeoGebra笔记功能体验课件
四邉形 (四年級) 教師版
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教學－直線方程性質
三角形外心的角度關係
星形工具(1060724)
homework3
基本作圖2
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Matrices
Straight Lines
Sphere
Rational Numbers
Upper and Lower Sum or Riemann Sum