If a cube with an edge length of 3 decimeters is cut into 3 cuboids, how much does its surface area increase?
把一个棱长3分米的正方体截成3个长方体，它的表面积增加多少
<gadget id="calculator">3 * 3 * 4</gadget>
<output>36</output>

<result>36</result>