Răspuns:
Explicație pas cu pas:
55/6 : a/b = 55/6 x b/a = 55b/6a
121/12 : a/b = 121/12 x b/a = 121b/12a
55b/6a = 110b/12a
121b/12a - 55b/6a = 1
121b/12a - 110/12a = 1
11b/12a = 1
11b = 12a
a/b = 11/12