(2007×2009+2008)÷(2008×2009-1)
=(2007×2009+2009-1)÷(2008×2009-1)
=[(2007+1)×2009-1)]÷(2008×2009-1)
=(2008×2009-1)÷(2008×2009-1)
=1
(2007×2009+2008)÷(2008×2009-1)
=(2007×2009+2009-1)÷(2008×2009-1)
=[(2007+1)×2009-1)]÷(2008×2009-1)
=(2008×2009-1)÷(2008×2009-1)
=1