The road construction team repaired a road, repaired its (2/7) on the first day, and repaired its (3/7) on the second day, what fraction of the road is left unrepaired?
修路队修一条路，第一天修了它的(2/7)，第二天修了它的(3/7)，还剩这条路的几分之几没修？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (2/7) - (3/7)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>