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橢圓尺
Author:
陳柄何
GeoGebra
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双心四边形
平行線的判定
中华人民共和国国旗
撒针估算面积实验
龙形曲线-分形龙2
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sin&cos
正弦公式2
KS2 數學
同心六邊形
劉虹圻 垂心
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Integers
Pyramid
Quadrilaterals
Numbers
Surface