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中国节灯笼
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孟宝兴
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錐體建築師
拼砌四邊形
兩組對邊相等的四邊形
找出對稱軸
三位數除以一位數（二）
Opdag Ressourcer
No.3
Triangle on sphere
對稱之美
classifying triangles
y=Asin(wx+f)图像变换
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Spejling
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Trekanter
Geometri
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