1) 8 7/12 - 5 19/36 = 8 21/36 - 5 19/36 = 3 2/36 = 3 1/18
2) 3 1/18 * 1 4/5 = 55/18 * 9/5 = 11/2
как-то так
1) 8 7/12 - 5 19/36 = 8 21/36 - 5 19/36 = 3 2/36 = 3 1/18
2) 3 1/18 * 1 4/5 = 55/18 * 9/5 = 11/2
как-то так