The engineering team wants to build a canal with a length of (7/8) kilometers. The full length (1/3) was repaired on the first day, and the full length (3/8) was repaired on the second day. What fraction is left?
工程队要修一条长(7/8)千米的水渠．第一天修了全长的(1/3)，第二天修了全长的(3/8)，还剩几分之几没有修？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (1/3) - (3/8)</gadget>
<output>7/24 = around 0.291667</output>

<result>7/24 = around 0.291667</result>