A cubic water tank without a cover, with a side length of 15 decimeters, how many square decimeters of iron sheet is needed at least?
一个无盖的正方体水箱，棱长15分米，至少需要铁皮多少平方分米？
<gadget id="calculator">15 * 15 * 5</gadget>
<output>1_125</output>

<result>1_125</result>