Calculation: 20092009*2009-20092008*2008-20092008.
计算：20092009*2009-20092008*2008-20092008．
<gadget id="calculator">20_092_009 * 2_009</gadget>
<output>40_364_846_081</output>

<gadget id="calculator">20_092_008 * 2_008</gadget>
<output>40_344_752_064</output>

<gadget id="calculator">40_364_846_081 - 40_344_752_064 - 20_092_008</gadget>
<output>2_009</output>

<result>2_009</result>