cuboid glass fish tank without a cover is 2 meters long, 0.5 meters wide, and 1 meter high. How many square meters of glass is needed to make such a fish tank?
一个长方体无盖的玻璃鱼缸，长2米，宽0.5米，高1米，做这样的一个鱼缸，需玻璃多少平方米？
<gadget id="calculator">2 * 0.5</gadget>
<output>1</output>

<gadget id="calculator">0.5 * 1</gadget>
<output>0.5</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">0.5 + 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<result>6</result>