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Congruent (SSS)4
Author:
Ricky Chan
GeoGebra
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活动三：应用性质
龙形曲线-分形龙
科赫雪花
撒针估算面积实验
第三周作业效果演示
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迪卡兒送給公主的信
數學操作課程_20150920
q5-10
三角形的底和高
Copy of sin(x) 的函數圖形
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Arithmetic
Straight Lines
Vectors
Centroid or Barycenter
Fractions