The engineering team repaired a railway, the first time it repaired (1/9) of the total length, and the second time it repaired the total length (2/9), what fraction of the total length was repaired twice?
工程队修一条铁路，第一次修了总长度的(1/9)，第二次修了总长度的(2/9)，两次共修了总长度的几分之几？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/9) + (2/9)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>