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Author:
cktsang
permutation (chi. ver.)
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
祖冲之的期望：内棋与外棋
折扣
撒针估算面积实验
盈利與虧蝕
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正弦函数图像
多項式函數
中空柱體
旋轉+伸縮正多邊形
題 3 的複本
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Centroid or Barycenter
Percentages
Linear Regression
Frequency Distribution
Reflection