20092009*201020102010-20102010*200920092009=how many.
20092009*201020102010-20102010*200920092009=多少．
<gadget id="calculator">20_092_009 * 201_020_102_010</gadget>
<output>4_038_897_698_765_838_090</output>

<gadget id="calculator">20_102_010 * 200_920_092_009</gadget>
<output>4_038_897_698_765_838_090</output>

<gadget id="calculator">4_038_897_698_765_838_090 - 4_038_897_698_765_838_090</gadget>
<output>0</output>

<result>0</result>