A project can be completed by team A in 10 days and team B in 8 days. Now teams A and B work together to complete the project ((())/(())) every day.
一项工程，甲队独做10天完成，乙队独做8天完成．现在甲乙两队合作，每天可以完成这项工程的((())/(()))．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) + (1/8)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>