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五邊反射
Author:
tammy93217
GeoGebra
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双心四边形
三角函数 的副本
龙形曲线-分形龙
撒针估算面积实验
平行線的判定
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百分數（小學）：折扣 / 賺賠（HTML5 版）
圓周率圓周率
combos ()
Areas of squares and rectangles_Question A至E
laptop height
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Translation
Prism
Inequalities
Area
Planes