Explicație pas cu pas:
a)1/9, 2/9, 4/9, 5/9, 6/9, 7/9, 9/9.
b)4/5, 4/6, 4/7, 4/8, 4/9, 4/10
c)1/7, 2/7, 3/7, 4/7, 5/7, 6/7, 7/7;
