If 3 cubes with edge length of 2 decimeters are glued together to form a cuboid, how much will the surface area be reduced by dm**2.
用3个棱长为2分米的正方体粘合成一个长方体，表面积减少多少dm**2．
<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<result>16</result>