To lay a 4 km long pipeline, the full length (1/8) is laid on the first day, and the full length (1/6) is laid on the second day. What fraction of the full length of this pipeline remains unpaved?
铺设一条4千米长的管道，第一天铺了全长的(1/8)，第二天铺了全长的(1/6)．这条管道还剩下全长的几分之几没有铺？
<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">(1/8) + (1/6)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">1 - (7/24)</gadget>
<output>17/24 = around 0.708333</output>

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