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S4E09 转动的圆
Author:
宋晓燕
GeoGebra
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中华人民共和国国旗
双心四边形
直線的斜率:水平變化 & 鉛垂變化
常见四边形是否是双心四边形
撒针估算面积实验
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隨機迷宮
zuiduan
repetitive squares by excel
大小相同串珠
小六 正方體的展開圖
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