How many square centimeters is the surface area reduced by gluing 3 cubes of 2 cm sides to form a cuboid?
把3个棱长2厘米的正方体木块胶合成一个长方体后，表面积减少了多少平方厘米．
<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<result>16</result>