To build a road, the first team repaired the total length (4/9), and the second team repaired the total length (3/9), what fraction of the road were built by the two teams?
修一条公路，第一队修了总长的(4/9)，第二队修了总长的(3/9)，两队共修了这条公路的几分之几？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) + (1/3)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>