1 supra 3 + 7 supra 15 = ??


Ajutor please!


Răspuns :

Numitor comun 15
(1•5)/15 + 7/15 =
(5+7)/15 =
12/15 =
4/5
1/3 + 7/15 = 

= (5 + 7)/15

= 12/15

= 4/5