A cuboid whose length is 3m, width and height are both 0.5m, if it is divided into two identical small cuboids, what is the minimum increase in surface area in square decimeters?
一个长方体，长是3m，宽和高都是0.5m，把它分割成两个完全一样的小长方体，表面积最少增加多少平方分米．
<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 2</gadget>
<output>50</output>

<result>50</result>