The road repair team built a road, 2.5 kilometers in the first week, 2 kilometers in the second week, and (4/9) left unrepaired, how many kilometers is this road?
修路队修一条路，第一周修了2.5千米，第二周修了2千米，还剩下(4/9)没有修，这条路长多少千米？
<gadget id="calculator">2.5 + 2</gadget>
<output>4.5</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4.5 / (5/9)</gadget>
<output>8.1</output>

<result>8.1</result>