e=71 grade 29 minute
F=23 grade 47 minute
e + f = 71 grade 29 minute + 23 grade 47 minute
= 94 grade 76 minute
= 95 grade 16 minute
e-f = 71 grade 29 minute - 23 grade 47 minute
= 70 grade 89 minute - 23 grade 47 minute
= 47 grade 42 minute
Sper ca te-am ajutat :)
