For a manuscript, A typed it (3/7), B typed it (1/3), and the two completed all of it.
一份稿件，甲打了它的(3/7)，乙打了它的(1/3)，两人一共完成了全部的多少．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

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

<gadget id="calculator">(3/7) + (1/3)</gadget>
<output>16/21 = around 0.761905</output>

<result>16/21 = around 0.761905</result>