A cuboid fish tank is 1.3 meters long, 0.5 meters wide, and 0.7 meters high. How many square decimeters of glass is needed to make such a fish tank without a cover?
一个长方体鱼缸，长1.3米，宽0.5米，高0.7米．做这样一个无盖的鱼缸需要玻璃多少平方分米？
<gadget id="calculator">1.3 * 0.5</gadget>
<output>0.65</output>

<gadget id="calculator">1.3 * 0.7 * 2</gadget>
<output>1.82</output>

<gadget id="calculator">0.5 * 0.7 * 2</gadget>
<output>0.7</output>

<gadget id="calculator">0.65 + 1.82 + 0.7</gadget>
<output>3.17</output>

<gadget id="calculator">3.17 * 100</gadget>
<output>317</output>

<result>317</result>