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答:(20) 正方體表面積為12cm^2,則每個面的面積=12/6=2 正方體邊長為a,則有:a^2=2 兩個正方體拼成一個長方體,有兩個面重合 所以:長方體的表面積=12+12-2a^2=24-4=20cm^2 所以:長方體的表面積為20cm^2
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