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正四面體交角
Author:
lamanleung
GeoGebra
New Resources
垂直線的斜率
斜率的值
圓周公式的應用
撒针估算面积实验
折扣
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整數或分數÷分數_ 工作紙（一）_題2b
使用中
物件的平移概念
Angle in alternate segment
三等分点连线围成的三角形特征（唐老师）
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Addition
Vectors 2D (Two-Dimensional)
Terms
Solids or 3D Shapes
Curve Sketching