Two people, A and B, do a job together. After working together for a period of time, A does the job (5/9), and B does the job (1/3). How much of the work did A and B do together?
甲、乙两人合做一件工作，合做一段时间后，甲做了这件工作的(5/9)，乙做了这件工作的(1/3)．甲、乙两人一共做了这件工作的几分之几？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">(5/9) + (1/3)</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>