N = \(\frac{2004+2005}{2005+2006}\)= \(\frac{2004}{2005+2006}\)+ \(\frac{2005}{2005+2006}\)
Vì \(\frac{2004}{2005}\)> \(\frac{2004}{2005+2006}\); \(\frac{2005}{2006}\)> \(\frac{2005}{2005+2006}\)
Nên \(\frac{2004}{2005}\)+ \(\frac{2005}{2006}\)> \(\frac{2004}{2005+2006}\)+ \(\frac{2005}{2005+2006}\)
Vậy M > N