(13-2-2)*(8-2-2)*2=9*4*2=72立方分米
(13-4)*(8-4)*2=72立方分米
长方体边长分别如下。长:13-2-2=9(dm)宽:8-2-2=4(dm)高:2(dm)长方体体积:9*4*2=72(dm³)
(13-4)*(8-4)*2=72?