Using 3 cubes whose edge length is 2dm to form a cuboid, the surface area of the cuboid is dm less than the sum of the surface areas of the 3 cubes**2.
用3个棱长是2dm的正方体合成一个长方体，长方体的表面积比3个正方体的表面积之和少多少dm**2．
<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<result>16</result>