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Author:
袁智强
GeoGebra
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龙形曲线-分形龙
科赫雪花
科氏力 (Coriolis Force)
百分數及其應用
盈利與虧蝕
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三角形，邊上平分面積
周界
斜坐標
尝试绘本
存款試算工具
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Linear Equations
Statistics
Probability
Histogram
Multiplication