A chemical fertilizer factory completed (3/5) of the production tasks in the first quarter in January and February this year, completed (5/7) of the production tasks in the first quarter in February and March, and completed the production tasks in the first quarter in February how much.
某化肥厂，今年一，二月份完成了第一季度生产任务的(3/5)，二、三月份完成了第一季度生产任务的(5/7)，二月份完成了第一季度生产任务的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(3/5) + (5/7)</gadget>
<output>46/35 = around 1.314286</output>

<gadget id="calculator">(46/35) - 1</gadget>
<output>11/35 = around 0.314286</output>

<result>11/35 = around 0.314286</result>