A section of highway is (8/9)km long, and (2/3)km has been repaired. How much less km is the rest than the repaired one?
一段公路长(8/9)km，已经修了(2/3)km．剩下的比已修的少多少km？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(8/9) - (2/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/3) - (2/9)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>