For a piece of rope, the full length (1/8) is used for the first time, and the full length (5/12) is used for the second time, how much of the full length is left.
一段绳子，第一次用去全长的(1/8)，第二次用去全长的(5/12)，还剩下全长的多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (1/8) - (5/12)</gadget>
<output>11/24 = around 0.458333</output>

<result>11/24 = around 0.458333</result>