(3 3\11 * 1 2\9 - 2 3\8) * 16\39
всё дроби
3 3/11 * 1 2/9 = 36/11 * 11/9 = 4
4 - 2 3/8 = 3 8/8 - 2 3/8 = 1 5/8
1 5/8 * 16/39 = 13/8 * 16/39 = 2/3