Calculation: 20112011*2011-20112010-20112010*2010=how much.
计算：20112011*2011-20112010-20112010*2010=多少．
<gadget id="calculator">20_112_011 * 2_011</gadget>
<output>40_445_254_121</output>

<gadget id="calculator">20_112_010 * 2_010</gadget>
<output>40_425_140_100</output>

<gadget id="calculator">40_445_254_121 - 20_112_010 - 40_425_140_100</gadget>
<output>2_011</output>

<gadget id="calculator">20_112_010 * 2_011 * 1</gadget>
<output>40_445_252_110</output>

<gadget id="calculator">40_445_254_121 - 40_445_252_110</gadget>
<output>2_011</output>

<result>2_011</result>