Răspuns:
1/4+2/4=3/4
3/4+2/4=5/4
5/4+2/4=7/4
8/4+2/4=10/4
1/4+2/4 = (1+2)/4 = 3/4
3/4+2/4 = (3+2)/4 = 5/4
5/4+2/4 = (5+2)/4 = 7/4
8/4+2/4 = (8+2)/4 = 10/4 = 5/2