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GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
球體建築師
四邉形 (四年級) 教師版
兩位數加法
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南瓜趣臉
三角形的工具
相似三角形的应用
販賣部草圖
連連看！橢圓在哪裡？
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Polygons
Random Experiments
Statistical Characteristics
Planes
Cuboid