Calculation: 2010+(1/2010)*(1/2011)-(1/2010)+(1/2011).
计算：2010+(1/2010)*(1/2011)-(1/2010)+(1/2011)．
<gadget id="calculator">1 / 2_010</gadget>
<output>1/2_010 = around 0.000498</output>

<gadget id="calculator">1 / 2_011</gadget>
<output>1/2_011 = around 0.000497</output>

<gadget id="calculator">(1/2_010) * (1/2_011)</gadget>
<output>1/4_042_110 = around 0</output>

<gadget id="calculator">(1/4_042_110) - (1/2_010)</gadget>
<output>-1/2_011 = around -0.000497</output>

<gadget id="calculator">2_010 + (-1/2_011) + (1/2_011)</gadget>
<output>2_010</output>

<result>2_010</result>