Two teams jointly repaired a (8/9) meter long road, team A repaired the full length (1/9), team B repaired the full length (1/3), and the rest of the road remained unrepaired.
两队合修一条长(8/9)米的路，甲队修了全长的(1/9)，乙队修了全长的(1/3)，还剩这条路的多少没修．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

<gadget id="calculator">1 - (1/9) - (1/3)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>