((2010*2011-1)/(2010+2009*2011)).
((2010*2011-1)/(2010+2009*2011))．
<gadget id="calculator">2_010 * 2_011</gadget>
<output>4_042_110</output>

<gadget id="calculator">4_042_110 - 1</gadget>
<output>4_042_109</output>

<gadget id="calculator">2_009 * 2_011</gadget>
<output>4_040_099</output>

<gadget id="calculator">2_010 + 4_040_099</gadget>
<output>4_042_109</output>

<gadget id="calculator">4_042_109 / 4_042_109</gadget>
<output>1</output>

<result>1</result>