What is the surface area of two small cubes with sides of 3 decimeters glued together to form a large cuboid?
把两个棱长都是3分米的小正方体粘成一个大长方体，它的表面积是多少．
<gadget id="calculator">3 * 3 * 10</gadget>
<output>90</output>

<result>90</result>