Calculation: 2013*20132012-2012*20132013.
计算：2013*20132012-2012*20132013．
<gadget id="calculator">2_013 * 20_132_012</gadget>
<output>40_525_740_156</output>

<gadget id="calculator">2_012 * 20_132_013</gadget>
<output>40_505_610_156</output>

<gadget id="calculator">40_525_740_156 - 40_505_610_156</gadget>
<output>20_130_000</output>

<result>20_130_000</result>