How many square decimeters of iron sheet are needed to make a square tank without a cover with a side length of 5 decimeters?
用铁皮做一个棱长为5分米的没有盖的正方体水槽，至少需要多少平方分米的铁皮．
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<result>125</result>