How many square decimeters of glass are needed to make a cubic glass fish tank without a cover with a side length of 3 decimeters?
做一个棱长3分米的无盖的正方体玻璃鱼缸，需要玻璃多少平方分米．
<gadget id="calculator">3 * 3 * 5</gadget>
<output>45</output>

<result>45</result>