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简谐运动
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GeoGebra
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双心四边形
盈利與虧蝕
比較五件物件的重量
第八周作业3
第三周作业效果演示
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peacock3
軌跡
Ex5C#13
四下_面積（一）(教師版)
抛物面
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Angles
Piecewise Functions
General Quadrilateral
Logarithmic Functions
Diagrams