If three cubes with side lengths of 1 cm are put together to form a cuboid, the surface area of the cuboid is reduced by the sum of the surface areas of the three cubes by how many square centimeters.
把3个棱长是1厘米的正方体，拼成一个长方体，这个长方体的表面积比三个正方体的表面积的和减少多少平方厘米．
<gadget id="calculator">1 * 1 * 4</gadget>
<output>4</output>

<result>4</result>