(1+(1/2009)+(1/2010)+(1/2011))*((1/2009)+(1/2010)+(1/2011)+(1/2012))-(1 +(1/2009)+(1/2010)+(1/2011)+(1/2012))*((1/2009)+(1/2010)+(1/2011)).
(1+(1/2009)+(1/2010)+(1/2011))*((1/2009)+(1/2010)+(1/2011)+(1/2012))-(1+(1/2009)+(1/2010)+(1/2011)+(1/2012))*((1/2009)+(1/2010)+(1/2011))．
<gadget id="calculator">2_009 / 1</gadget>
<output>2_009</output>

<gadget id="calculator">2_010 / 1</gadget>
<output>2_010</output>

<gadget id="calculator">2_011 / 1</gadget>
<output>2_011</output>

<gadget id="calculator">1 + 2_009 + 2_010 + 2_011</gadget>
<output>6_031</output>

<gadget id="calculator">2_012 / 1</gadget>
<output>2_012</output>

<gadget id="calculator">2_009 + 2_010 + 2_011 + 2_012</gadget>
<output>8_042</output>

<gadget id="calculator">6_031 * 8_042</gadget>
<output>48_501_302</output>

<gadget id="calculator">1 + 2_009 + 2_010 + 2_011 + 2_012</gadget>
<output>8_043</output>

<gadget id="calculator">2_009 + 2_010 + 2_011</gadget>
<output>6_030</output>

<gadget id="calculator">8_043 * 6_030</gadget>
<output>48_499_290</output>

<gadget id="calculator">48_501_302 - 48_499_290</gadget>
<output>2_012</output>

<gadget id="calculator">1 / 2_012</gadget>
<output>1/2_012 = around 0.000497</output>

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