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梯形转化平行四边形
Author:
吕玉雷
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等的四邊形
算柱 (兩位數)
四邉形 (四年級) 教師版
球體建築師
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雙曲線之極偶 / polarity for hyperbola
ggggggg
座標變換_數線
第一組
中研院數學所
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Continuity
Dilation
Variance
Angles
Numbers