If 4 cubes with side length 2dm are put together in a row to form a cuboid, how much will the surface area be reduced?
把4个棱长2dm的正方体顺次拼成一排，变成一个长方体，则表面积减少多少．
<gadget id="calculator">2 * 2 * 6</gadget>
<output>24</output>

<result>24</result>