Calculation: (1/(1+(1/(2011+(1/2012)))))+(1/(1-(1/(2013+(1/2012)))))=how much.
计算：(1/(1+(1/(2011+(1/2012)))))+(1/(1-(1/(2013+(1/2012)))))=多少．
<gadget id="calculator">1 / 2_012</gadget>
<output>1/2_012 = around 0.000497</output>

<gadget id="calculator">2_011 + (1/2_012)</gadget>
<output>4_046_133/2_012 = around 2_011.000497</output>

<gadget id="calculator">1 / (4_046_133/2_012)</gadget>
<output>2_012/4_046_133 = around 0.000497</output>

<gadget id="calculator">1 + (2_012/4_046_133)</gadget>
<output>4_048_145/4_046_133 = around 1.000497</output>

<gadget id="calculator">1 / (4_048_145/4_046_133)</gadget>
<output>4_046_133/4_048_145 = around 0.999503</output>

<gadget id="calculator">2_013 + (1/2_012)</gadget>
<output>4_050_157/2_012 = around 2_013.000497</output>

<gadget id="calculator">1 / (4_050_157/2_012)</gadget>
<output>2_012/4_050_157 = around 0.000497</output>

<gadget id="calculator">1 - (2_012/4_050_157)</gadget>
<output>4_048_145/4_050_157 = around 0.999503</output>

<gadget id="calculator">1 / (4_048_145/4_050_157)</gadget>
<output>4_050_157/4_048_145 = around 1.000497</output>

<gadget id="calculator">(4_046_133/4_048_145) + (4_050_157/4_048_145)</gadget>
<output>2</output>

<result>2</result>