Put a 5cm long, 4cm wide, and 5cm high cuboid wooden block on the table, cut it longitudinally and divide it into two identical small cuboids, how much cm can the surface area increase at most**2.
把一个长5cm，宽4cm，高5cm的长方体木块放在桌面上，纵切一刀分成两个完全一样的小长方体，表面积最多能增加多少cm**2．
<gadget id="calculator">5 * 5 * 2</gadget>
<output>50</output>

<result>50</result>