For a wire, the full length (1/6) is used for the first time, and the full length (1/2) is used for the second time, and how much of the full length is used for the two times.
一根电线，第一次用去全长的(1/6)，第二次用去全长的(1/2)，两次共用去全长的多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/6) + (1/2)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>