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三角形外心
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1041018
GeoGebra
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圓的基本性質
盈利與虧蝕
三角函数 的副本
第八周作业
双心四边形
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層層出現的圓
點到直線距離
橢圓重心軌跡1
錯角---水平平行綫
探索勾股三元数
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Histogram
Derivative
Congruence
Parametric Curves
Statistics