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平行四邊形
Author:
keihin
GeoGebra
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圓的基本性質
活动三：应用性质
异形操场
第三周作业效果演示
中华人民共和国国旗
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special
正餘弦函數疊合
畢氏定理
小五面積
数学几何
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Prism
Matrices
Differential Calculus
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Constructions