2010+20102010+201020102010/2009+20092009+200920092009 -1/2009
=(2010+2010×10001+2010×100010001)/(2009+2009×10001+2009×100010001) -1/2009
=2010×(1+10001+100010001)/[2009×(1+10001+100010001)] -1/2009
=2010/2009 -1/2009
=2009/2009
=1