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S4E08 Penrose阶梯
Author:
宋晓燕
GeoGebra
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三位數除以一位數（一）
找出對稱軸
兩位數加法
直角坐標平面上的旋轉變換
算柱 (兩位數)
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這是我的答案
directed number_magnet model
Copy of 固定周界的長方形的面積變化
百分數及其應用
画直线等分三角形的面积
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Scatter Plot
Centroid or Barycenter
Step Functions
Geometric Mean
Correlation