20092009*2010-20102010*2009; how much.
20092009*2010-20102010*2009；多少．
<gadget id="calculator">20_092_009 * 2_010</gadget>
<output>40_384_938_090</output>

<gadget id="calculator">20_102_010 * 2_009</gadget>
<output>40_384_938_090</output>

<gadget id="calculator">40_384_938_090 - 40_384_938_090</gadget>
<output>0</output>

<result>0</result>