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體積為36cm^3 右面積為24cm^3 所以左右厚度=36/24=1.5cm 所以長度=體積/(寬*厚)=36/(5*1.5)=4.8cm 所以表面積=2(4.8*1.5+5*1.5+4.8*5)=2*(7.2+7.5+24)=2*38.7=77.4cm^2
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