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GeoGebra
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ie 4
Author:
LAM YU SANG
GeoGebra
New Resources
判斷球體
異分母分數減法
兩位數加法
球體建築師
球体的体积推导（优化版）
Discover Resources
二面角
World's Hardest Easy Geometry Problem.
補角關係
圓與直線
吃點點
Discover Topics
Continuity
Confidence Interval
Percentages
Linear Functions
Polygons