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形心计算
Author:
阳光
GeoGebra
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多邊形的面積
斜率的值
折扣
盈利與虧蝕
撒针估算面积实验
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指數函數的圖形(2)
生活中的平面圖形問題2
直線坐標標點
Copy of 畢式定理 (06)
Rotational and reflectional symmetry of a regular polygon