20082008*2007-20072007*2008=how many.
20082008*2007-20072007*2008=多少．
<gadget id="calculator">20_082_008 * 2_007</gadget>
<output>40_304_590_056</output>

<gadget id="calculator">20_072_007 * 2_008</gadget>
<output>40_304_590_056</output>

<gadget id="calculator">40_304_590_056 - 40_304_590_056</gadget>
<output>0</output>

<result>0</result>