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圆展开---探究圆周率
Author:
陈宜红
GeoGebra
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比較五件物件的重量
折扣
第三周作业效果演示
科氏力 (Coriolis Force)
异形操场
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latex 的東西
百分數：買賣問題（Java 版）
橢圓重心軌跡1
實作作業2
小数除法
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Parabola
Cone
Quadratic Functions
Matrices
Equilateral Triangles