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對稱圖形
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lily44559966
GeoGebra
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活动三:应用性质
中华人民共和国国旗
常见四边形是否是双心四边形
龙形曲线-分形龙
科赫雪花
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Q5-7
CircleIII
大園寶
時鐘
旋轉圓
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Parallelogram
Volume
Probability
Inequalities
Rectangle