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練習1
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1041057
GeoGebra
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圓的基本性質
龙形曲线-分形龙
折扣
比較五件物件的重量
第三周作业效果演示
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橢圓軌跡 (4)
过圆上一点作切线，三步
圓形墊圈 (Washer) 2
橢圓的副本
正方形纸片剪出正三角形（顶点在边上）
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Median Value
Limits
Statistics
Rhombus
Dilation