Putting together two identical small cubes into a cuboid, the surface area is reduced by 18 decimeters**2, what is the surface area of each small cube?
把两个完全一样的小正方体拼成一个长方体，表面积减少了18分米**2，每个小正方体的表面积是多少？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>