To build a road, the full length (2/7) was repaired in the first week, and more (1/7) of this road was built in the second week than in the first week. What fraction of this road was built in two weeks?
修一条路，第一周修了全长的(2/7)，第二周的比第一周多这条路的(1/7)．两周共修了这条路的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(2/7) + (1/7) + (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>