A cuboid wooden box without a cover is 70 cm long, 40 cm wide, and 50 cm high. To make such a wooden box, how many square meters of wood is needed at least?
一个无盖的长方体木箱，长70厘米，宽40厘米，高50厘米，制作这样一个木箱，至少需要木板多少平方米？
<gadget id="calculator">70 * 40</gadget>
<output>2_800</output>

<gadget id="calculator">50 * 70 * 2</gadget>
<output>7_000</output>

<gadget id="calculator">40 * 50 * 2</gadget>
<output>4_000</output>

<gadget id="calculator">2_800 + 7_000 + 4_000</gadget>
<output>13_800</output>

<gadget id="calculator">13_800 / 10_000</gadget>
<output>69/50 = around 1.38</output>

<result>69/50 = around 1.38</result>