=2010^2+2009^2-1+2011^2-1
=2010^2+(2009+1)(2009-1)+(2011+1)(2011-1)
=2010^1+2010*2008+2010*2012
=2010(2010+2008+2012)
=2010*6030
=12120300
=2010^2+2009^2-1+2011^2-1
=2010^2+(2009+1)(2009-1)+(2011+1)(2011-1)
=2010^1+2010*2008+2010*2012
=2010(2010+2008+2012)
=2010*6030
=12120300