Install angle irons on a rectangular parallelepiped glass cabinet with a length of 2m, a width of 60cm, and a height of 80cm. How many meters of angle irons are needed at least?
给一个长2m，宽60cm，高80cm的长方体玻璃柜装上角铁，至少需要多少米角铁？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 + (3/5) + (4/5)</gadget>
<output>17/5 = around 3.4</output>

<gadget id="calculator">(17/5) * 4</gadget>
<output>68/5 = around 13.6</output>

<result>68/5 = around 13.6</result>