A cuboid without a cover is 0.6m long, 0.3m wide, and 0.4m deep. How many square meters of glass should be used to make this fish tank?
一种无盖的长方体，长0.6m，宽0.3m，深0.4m，做这个鱼缸至少要用多少平方米的玻璃？
<gadget id="calculator">0.6 * 0.3</gadget>
<output>0.18</output>

<gadget id="calculator">0.6 * 0.4 * 2</gadget>
<output>0.48</output>

<gadget id="calculator">0.3 * 0.4 * 2</gadget>
<output>0.24</output>

<gadget id="calculator">0.18 + 0.48 + 0.24</gadget>
<output>0.9</output>

<result>0.9</result>