Пошаговое объяснение:
1.
6 7/35 - 4 15/35 = 5 42/35 - 4 15/35 =
1 27/35
2.
6 - 2 3/8 = 5 8/8 - 2 3/8 = 3 5/8
3.
7/9 * 2/5 = 14/45
4.
3 3/5 * 2 2/9 = 18/5 * 20/9 = 2/1 * 4/1 = 8/1 = 8
