Calculation: ((2010+2009*2011)/(2010*2011-1))+((2011+2010*2012)/(2011*2012-1))+((2012+2011*2013)/(2012* 2013-1)).
计算：((2010+2009*2011)/(2010*2011-1))+((2011+2010*2012)/(2011*2012-1))+((2012+2011*2013)/(2012*2013-1))．
<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">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">4_042_109 / 4_042_109</gadget>
<output>1</output>

<gadget id="calculator">2_010 * 2_012</gadget>
<output>4_044_120</output>

<gadget id="calculator">2_011 + 4_044_120</gadget>
<output>4_046_131</output>

<gadget id="calculator">2_011 * 2_012</gadget>
<output>4_046_132</output>

<gadget id="calculator">4_046_132 - 1</gadget>
<output>4_046_131</output>

<gadget id="calculator">4_046_131 / 4_046_131</gadget>
<output>1</output>

<gadget id="calculator">2_011 * 2_013</gadget>
<output>4_048_143</output>

<gadget id="calculator">2_012 + 4_048_143</gadget>
<output>4_050_155</output>

<gadget id="calculator">2_012 * 2_013</gadget>
<output>4_050_156</output>

<gadget id="calculator">4_050_156 - 1</gadget>
<output>4_050_155</output>

<gadget id="calculator">4_050_155 / 4_050_155</gadget>
<output>1</output>

<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<result>3</result>