What is the maximum surface area of a cube whose 6 sides are all 5dm long and form a cuboid?
6个棱长都是5dm的正方体，拼成一个长方体，表面积最大是多少？
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">150 + 150 + 25</gadget>
<output>325</output>

<gadget id="calculator">325 * 2</gadget>
<output>650</output>

<result>650</result>