Răspunsuri

2014-01-20T17:49:59+02:00
1/(1*2)+1/(2*3)+1/(3*4)+........+1/n*(n+1)<2012/2013
1/1-1/2+1/2-1/3+1/3-1/4+........+1/n-1/n+1<2012/2013
1-1/n+1<2012/2013
Amplific pe 1 cu n+1
n+1-1/n+1<2012/2013
n/n+1<2012/2013
2013n<2012n-2012
2013n-2012n<(-2012)
n<(-2012)

unde nu intelegi ma intrebi