If a piece of wood with a length of 2.4 meters, a width of 0.8 meters, and a height of 0.4 meters is sawed into 2 parts of equal volume, how many square meters should its surface area increase at least?
把一根长2.4米、宽0.8米、高0.4米的木料锯成体积相等的2份，它的表面积最少增加多少平方米？
<gadget id="calculator">0.8 * 0.4 * 2</gadget>
<output>0.64</output>

<result>0.64</result>