After 3 identical squares are put together to form a cuboid, the surface area of the cuboid is reduced by 36 square centimeters from the sum of the surface areas of the original 3 cubes. What is the volume of the cuboid in cubic centimeters?
3个完全相同的正方形体拼成一个长方形体后，长方体的表面积比原来3个正方体表面积的总和减少了36平方厘米，长方体的体积是多少立方厘米．
<gadget id="calculator">3 * 3 * 3 * 3</gadget>
<output>81</output>

<result>81</result>