Calculation: ((1949*2012)/(1949+1949**2))+((1949*2012)/(1950+1950**2))+((1949*2012)/(1951+1951**2 ))+...+((1949*2012)/(2012+2012**2)).
计算：((1949*2012)/(1949+1949**2))+((1949*2012)/(1950+1950**2))+((1949*2012)/(1951+1951**2))+…+((1949*2012)/(2012+2012**2))．
<gadget id="calculator">1 / 1_949</gadget>
<output>1/1_949 = around 0.000513</output>

<gadget id="calculator">1 / 2_013</gadget>
<output>1/2_013 = around 0.000497</output>

<gadget id="calculator">(1/1_949) - (1/2_013)</gadget>
<output>64/3_923_337 = around 0.000016</output>

<gadget id="calculator">1_949 * 2_012 * (64/3_923_337)</gadget>
<output>128_768/2_013 = around 63.968207</output>

<result>128_768/2_013 = around 63.968207</result>