没图!
假如是依次叠放,则减少了3x3两个面以及减少了4x4两个面,
表面积=3x3x6-3x3x2+4x4x6-4x4x2+5x5x6
=3x3x4+4x4x4+5x5x6
=36+64+150
=250(平方分米)