A rope is used up (3/9) for the first time and (5/9) for the second time, what fraction of the rope is left?
一根绳子，第一次用去(3/9)，第二次用去(5/9)，还剩下这根绳子的几分之几？
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (1/3) - (5/9)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>