If 4 cubes with side lengths of 2 decimeters are used to form a rectangle, what is the minimum surface area of the cube?
用棱长是2分米的4个正方体拼成一个长方形，拼成长方体的表面积最小是多少平方分米．
<gadget id="calculator">4 * 4 * 2</gadget>
<output>32</output>

<gadget id="calculator">4 * 2 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 + 32</gadget>
<output>64</output>

<result>64</result>