Calculation: ((2012*2013-1)/(2012+2011*2013)).
计算：((2012*2013-1)/(2012+2011*2013))．
<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">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">4_050_155 / 4_050_155</gadget>
<output>1</output>

<result>1</result>