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圆的展开与计算
Author:
九章算术
GeoGebra
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龙形曲线-分形龙
第三周作业效果演示
比較五件物件的重量
撒针估算面积实验
百分數及其應用
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三角形内角和，演示
Values of nCr & nPr 排列與組合的值
配方法圖解
anlge at centre twice angle at circumference
對稱之美
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Special Points
Cuboid
Means
Polygons
Inequalities