(1+(1/2)+(1/3)+…+(1/2011))*((1/2)+(1/3)+(1/4)+…+(1/2012) )-((1/2)+(1/3)+...+(1/2011))*(1+(1/2)+(1/3)+...+(1/2012)).
(1+(1/2)+(1/3)+…+(1/2011))*((1/2)+(1/3)+(1/4)+…+(1/2012))-((1/2)+(1/3)+…+(1/2011))*(1+(1/2)+(1/3)+…+(1/2012))．
<gadget id="calculator">1 / 2_012</gadget>
<output>1/2_012 = around 0.000497</output>

<result>1/2_012 = around 0.000497</result>