Найди разность смешанных чисел: 12 5/9 - 7 1/6, 7 1/4 - 3 7/15, 9 5/12 - 6 2/7, 4 1/6 - 2 4/21, 5 9/25 - 3 8/15 (дам 35 баллов)

12 5/9-7 1/6=12 10/18-7 3/18=5 7/18 7 1/4-3 7/15=7 15/60-3 28/60=6 75/60-3 28/60=3 47/60 9 5/12-6 2/7=9 35/84-6 24/84=3 11/84 4 1/6-2 4/21=4 7/42-2 8/42=3 49/42-2 8/42=1 41/42 5 9/25-3 8/15=5 27/75-3 40/75=4 102/75-3 40/75=1 62/75