A piece of rope was used for the first time (1/9) and for the second time (4/9), how much was used for the two times?
一条绳子，第一次用了(1/9)，第二次用了(4/9)，两次一共用了几分之几？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

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

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