(20092009 * 2010-20102010 * 2009)

20092009*2010-20102010*2009
=10001*2009*2010-10001*2010*2009
=10001*2009*2010-10001*2009*2010
=0

2009 * 20102010-2010 * 20092009 process and explanation!

Original formula: 2009 × 20102010-2010 × 20092009
=2009×（2010×10001）-2010×（2009×10001）…… The method of using decomposition factor
=2009×2010×10001-2009×2010×10001…… The combination of multiplication is used
=0…… Because they are exactly the same, they are equal to 0
Thank you

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