To build a (7/8) kilometer road, the full length (3/10) was built on the first day, and the full length (1/3) was built on the second day. How much of this road is left unrepaired?
修一条(7/8)千米的路，第一天修了全长的(3/10)，第二天修了全长的(1/3)．这条路还剩几分之几没修？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (3/10) - (1/3)</gadget>
<output>11/30 = around 0.366667</output>

<result>11/30 = around 0.366667</result>