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Author:
Ricky Chan
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙
异形操场
双心四边形
比較五件物件的重量
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Concept of Similarity 相似的概念
ddsdsad
不規則形陰影作圖2
聖誕樹
中心对称与轴对称图形.许兴华数学
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Volume
Combinatorics
Median Value
Sequences and Series
Upper and Lower Sum or Riemann Sum