Using 6 cubes with edge length 3dm to form a cuboid, what is the maximum reduction of the surface area in dm**2.
用棱长3dm的6个正方体拼成一个长方体，表面积最多减少多少dm**2．
<gadget id="calculator">3 * 3 * 14</gadget>
<output>126</output>

<result>126</result>