calculeaza :a) 2/3+2/3^2+2/3^3+....+2/3^99+2/3^100+1/3^100
b) 4/5+4/5^2+4/5^3+...+4/5^99+4/5^100+1/5^100
Va rog ajutați-mă! Dau coroana!
