2012*2011.2011-2010*2012.2012=how much.
2012*2011.2011-2010*2012.2012=多少．
<gadget id="calculator">2_012 * 2_011.2011</gadget>
<output>4_046_536.6132</output>

<gadget id="calculator">2_010 * 2_012.2012</gadget>
<output>4_044_524.412</output>

<gadget id="calculator">4_046_536.6132 - 4_044_524.412</gadget>
<output>2_012.2012</output>

<result>2_012.2012</result>