(12x8+12x4x2+8x4x2-28.4)x0.2=45.52
你好,很高兴可以为您解答!S=S天花板+S四壁 =12*8+2*(8*4+4*12)-28.4 =96+160-28.4 =227.6平方米227.6*0.2=45.52千克望采纳~
求采纳!!!