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凯子巨人
GeoGebra
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比較五件物件的重量
讀磅
祖冲之的期望：内棋与外棋
盈利與虧蝕
圓的切線方程
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Homework3
美國隊長盾牌
雙曲線的頂點
大小相同串珠
RLC並聯諧振
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Rectangle
Special Points
General Quadrilateral
Square
Symmetry