2006÷(2007/2008)
=2006×2008/2007
=(2007-1)×2008/2007
=2007×2008/2007-1×2008/2007
=2008-2008/2007
=2008-(1+1/2007)
=2008-1-1/2007
=2007-1/2007
=2006又2006/2007
2006÷(2007/2008)
=2006×2008/2007
=(2007-1)×2008/2007
=2007×2008/2007-1×2008/2007
=2008-2008/2007
=2008-(1+1/2007)
=2008-1-1/2007
=2007-1/2007
=2006又2006/2007