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kevin20020905
GeoGebra
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中华人民共和国国旗
常见四边形是否是双心四边形
第八周作业
异形操场
盈利與虧蝕
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永遠垂直、以像素為單位的向量？
Ratio of angles at the centre and the length of the arcs.
平行線
餘弦定理的圖形證明
GeoGebra创建的小游戏集
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Similar Triangles
Histogram
Subtraction
Translation
Percentages