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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（一）
柱體建築師
GeoGebra笔记功能体验课件
球體建築師
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regular hexagon construction
傅立葉級數
軌跡三︰移動點與一固定線段保持固定距離(運動場跑道)
拋物線1-焦點法
三角形的三心
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Rectangle
Statistics
General Quadrilateral
Cube
Geometric Mean