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Author:
Wolil Io
GeoGebra
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百分數及其應用
常见四边形是否是双心四边形
中华人民共和国国旗
双心四边形
第八周作业
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有趣的切圓
物件的平移概念
Illusion-若隐若现的白点
作垂线或平行线
序列的应用案例--挤油的圆
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Congruence
Mathematics
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