Răspuns:
Explicație pas cu pas:
a) 3/3, 3/4, 3/5
4/3, 4/4, 4/5
5/3, 5/4, 5/5
b) 7/4, 8/7, 8/4
c) 7/13+5/13=12/13
d) 21/6-9/6=12/6=2