The engineering team built a (8/9) kilometer long road, completed the full length (1/5) in the first week, completed the full length (1/4) in the second week, and left the full length How much is not repaired?
工程队修一条长(8/9)千米的公路，第一周完成了全长的(1/5)，第二周又完成了全长的(1/4)，还剩下全长的几分之几没修？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>