To make a cuboid glass fish tank without a cover, the length is 8dm, the width is 5dm, and the height is 4dm. How many square decimeters of glass are needed at least?
做一个无盖的长方体玻璃鱼缸，长8dm，宽5dm，高4dm，至少需要多少平方分米的玻璃？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 4 * 2</gadget>
<output>64</output>

<gadget id="calculator">5 * 4 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 64 + 40</gadget>
<output>144</output>

<result>144</result>