A cuboid is 8cm long, 5cm wide, and 2cm high. How much is the area of its largest surface greater than its smallest surface in cm**2.
一个长方体长是8cm，宽5cm，高2cm，它最大面比最小面面积多多少cm**2．
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<result>30</result>