Cut a large square into 8 small cubes of the same size. The surface area of each small cube is 18 cm**2. What is the surface area of the original cube in cm**2.
将一个大正方形切成大小相同的8个小正方体，每个小正方体的表面积是18cm**2，原正方体的表面积是多少cm**2．
<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<gadget id="calculator">3 * 4 * 6</gadget>
<output>72</output>

<result>72</result>