Calculation: ((1/2)+(1/3)+…+(1/2013))*(1+(1/2)+…+(1/2012))-(1+(1/2) +(1/3)+...+(1/2013))*((1/2)+(1/3)+...+(1/2012)).
计算：((1/2)+(1/3)+…+(1/2013))*(1+(1/2)+…+(1/2012))-(1+(1/2)+(1/3)+…+(1/2013))*((1/2)+(1/3)+…+(1/2012))．
<gadget id="calculator">1 / 2_013</gadget>
<output>1/2_013 = around 0.000497</output>

<result>1/2_013 = around 0.000497</result>