The road repair team built a road, the first day (2/7) of the full length, the second day (3/4) of the first day, and the second day the full length ((())/( ())).
修路队修了一条路，第一天修了全长的(2/7)，第二天修的是第一天的(3/4)，第二天修了全长的((())/(()))．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/7) * (3/4)</gadget>
<output>3/14 = around 0.214286</output>

<result>3/14 = around 0.214286</result>