N= 1/(1*2) + 1/(2*3) +.....+1/(2007*2008)
1/(1*2)= 1/1 -1/2
1/(2*3)= 1/2 -1/3
1/(3*4)= 1/3 -1/4
............................................
1/(2006*2007)= 1/2006 -1/2007
1/(2007*2008)= 1/2007- 1/2008
N= 1/1 -1/2008 aducem la acelasi numitor
N=(2008-1)/2008= 2007/2008= 0,999 (partea intreaga este 0)