(9999+2009/2010)*9999
=(9999+1-1/2010)*9999
=(10000-1/2010)*9999
=99990000-9999/2010
=99990000-4又1959/2010
=99989995又51/2010
=99989995又17/670
(9999+2009/2010)*9999
=(9999+1-1/2010)*9999
=(10000-1/2010)*9999
=99990000-9999/2010
=99990000-4又1959/2010
=99989995又51/2010
=99989995又17/670