Răspuns :
1 1 1+2012 1
Grupam ultimele 2 fractii ---------------- + --------- = ---------- -- = --------
2012*2013 2013 2012*2013 2012
1 1 1
Acum pe ------------------ + ---------- = --------
2011*2012 2012 2011
1
Si conform regulii obtinute => --------
2008
Grupam ultimele 2 fractii ---------------- + --------- = ---------- -- = --------
2012*2013 2013 2012*2013 2012
1 1 1
Acum pe ------------------ + ---------- = --------
2011*2012 2012 2011
1
Si conform regulii obtinute => --------
2008