((2013*2014-1)/(2013+2012*2014))=how much.
((2013*2014-1)/(2013+2012*2014))=多少．
<gadget id="calculator">2_013 * 2_014</gadget>
<output>4_054_182</output>

<gadget id="calculator">4_054_182 - 1</gadget>
<output>4_054_181</output>

<gadget id="calculator">2_012 * 2_014</gadget>
<output>4_052_168</output>

<gadget id="calculator">2_013 + 4_052_168</gadget>
<output>4_054_181</output>

<gadget id="calculator">4_054_181 / 4_054_181</gadget>
<output>1</output>

<result>1</result>