After 3 identical cubes are put together to form a cuboid, the surface area is reduced by 36dm**2. What is the volume of the cuboid?
3个完全一样的正方体拼成1个长方体后，表面积减少了36dm**2，这个长方体的体积是多少？
<gadget id="calculator">3 * 3 * 3 * 3</gadget>
<output>81</output>

<result>81</result>