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希式半月形的變形
Author:
黃國斌
GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
錐體建築師
兩位數除以一位數（二）
球体的体积推导（优化版）
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index
圓餅圖
串珠(兩種顏色)
折纸角度探究1
折纸角度探究2
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Dilation
Centroid or Barycenter
Random Experiments
Variance
Statistical Characteristics