Răspuns :
N+1=12x5/3 (12 si 3 se simplifica prin 3)
N+1= 4x5
N+1= 20
N=20-1
N= 19
N+1= 4x5
N+1= 20
N=20-1
N= 19
[tex] \frac{N+1}{12} = \frac{5}{3} = \frac{N+1}{12} = \frac{20}{12} = \frac{20-1}{12} = \frac{19+1}{12} = \frac{5}{3} [/tex]