The factory completed (3/5) of the planned tasks in the first half of the month, and (1/2) of the planned tasks in the second half of the month. What percentage of the tasks did the factory overfulfill this month?
工厂上半月完成计划任务的(3/5)，下半月完成计划任务的(1/2)，工厂这个月超额完成任务的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - 1</gadget>
<output>-1/2 = around -0.5</output>

<gadget id="calculator">(3/5) + (-1/2)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>