Calculation: 20122013*20132012-20122012*20132013=how much.
计算：20122013*20132012-20122012*20132013=多少．
<gadget id="calculator">20_122_013 * 20_132_012</gadget>
<output>405_096_607_180_156</output>

<gadget id="calculator">20_122_012 * 20_132_013</gadget>
<output>405_096_607_170_156</output>

<gadget id="calculator">405_096_607_180_156 - 405_096_607_170_156</gadget>
<output>10_000</output>

<result>10_000</result>