1997*19961996-1996*19971997.
1997*19961996-1996*19971997．
<gadget id="calculator">1_997 * 19_961_996</gadget>
<output>39_864_106_012</output>

<gadget id="calculator">1_996 * 19_971_997</gadget>
<output>39_864_106_012</output>

<gadget id="calculator">39_864_106_012 - 39_864_106_012</gadget>
<output>0</output>

<result>0</result>