2002²-2001×2003 2001²-2010×2012
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![2002²-2001×2003 2001²-2010×2012](/uploads/image/z/1988433-9-3.jpg?t=2002%26%23178%3B-2001%C3%972003+2001%26%23178%3B-2010%C3%972012)
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2002²-2001×2003 2001²-2010×2012
2002²-2001×2003 2001²-2010×2012
2002²-2001×2003 2001²-2010×2012
2002²-2001×2003
=2002²-(2002-1)(2002+1)
=2002²-2002²+1
=1
2001²-2010×2012
=2011²-(2011-1)(2011+1)
=2011²-2011²+1
=1