1) 35 + 28 / 35 - 28 = 7 (5 + 4) / 7 (5 - 4) = 5 + 4 / 5 - 4 = 9/1 = 9
2) 75 - 33 / 75 + 33 = 3 (15 - 11) / 3 (15 + 11) = 15 - 11 / 15 + 11 = 4/26
3) 24 + 3 / 24 * 3 = 3 (8 + 1) / 3 * 24 = 8 + 1 / 24 = 9/24 = 3/8
4) 15 - 6 / 15 * 6 = 3 (5 - 2) / 3 * 5 * 6 = 5 - 2 / 5 * 6 = 3/30 = 1/10 = 0,1
5) 12 * 3 / 12 + 3 = 3 * 12 / 3 (4 + 1) = 12 / 4 + 1 = 12/5 = 2,4
6) 26 + 2 / 26 * 2 = 2 (13 + 1) / 2 * 26 = 13 + 1 / 26 = 14/26 = 7/13