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餘弦定理修正項及風車證明
Author:
薛鈞聰
GeoGebra
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撒针估算面积实验
中华人民共和国国旗
科赫雪花
折扣
双心四边形
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新型軌跡
正立方體
向量比換面積比
整数乘法演示
圓的基本性質
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Numbers
Mathematics
Integral Calculus
Arithmetic Operations
Polygons