A long (7/8) meter long iron wire, the first use up the full length (1/8), the first use up the full length (1/6). What fraction of the full length is left?
一根长(7/8)米长的铁丝，第一次用去全长的(1/8)，第一次用去全长的(1/6)．还剩下全长的几分之几？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/8) - (1/6)</gadget>
<output>17/24 = around 0.708333</output>

<result>17/24 = around 0.708333</result>