How many square decimeters is the surface area reduced when three cubes of 3 decimeter sides are assembled into a cuboid?
把3个棱长为3分米的正方体木块，拼成一个长方体后，表面积减少了多少平方分米．
<gadget id="calculator">3 * 3 * 4</gadget>
<output>36</output>

<result>36</result>