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祖暅之《綴術》：「緣冪勢既同，則積不容異。」
Author:
johnmayhk
GeoGebra
New Resources
折扣
第八周作业2
圓的基本性質
常见四边形是否是双心四边形
撒针估算面积实验
Discover Resources
Billiard Ball
九點共圓
橢圓截圓錐
拋物線1--焦點法
f(x)=cosx的圖形--伸縮與平移
Discover Topics
Angles
Stochastic Process or Random Process
Unit Circle
Curve Sketching
Ratios