To make a washing machine cover with a length of 50 cm, a width of 40 cm, and a height of 90 cm, how many square meters of fabric should be used at least?
做一个长50厘米、宽40厘米、高90厘米的洗衣机套，至少要用多少平方米布料？
<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">90 * 2 * 90</gadget>
<output>16_200</output>

<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">16_200 + 2_000</gadget>
<output>18_200</output>

<gadget id="calculator">18_200 / 10_000</gadget>
<output>91/50 = around 1.82</output>

<result>91/50 = around 1.82</result>