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Twist Bottle
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陳隆期
GeoGebra
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錐體建築師
画直线等分三角形的面积
拼砌四邊形
GeoGebra笔记功能体验课件
兩位數除以一位數（一）
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物理
任意角的三角函数
工具：PlaneArrows, PlaneText... (v.2)
tan90
畫鐘面的副本
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Integral Calculus
Addition
Quadrilaterals
Solids or 3D Shapes
Histogram