1) 8 2/3 : 1 4/9 = 26/3 : 13/9 = 26/3 * 9/13 = 6
2)6 - 3 3/8 = 6 - 27/8 = 48/8 - 27/8 = 21/8 = 2 5/8
3) 2 5/8 + 1 5/8 = 21/8 + 13/8 = 34/8 = 17/4 = 4 1/4
4)1/13 * 4 1/4 = 1/13 * 17/4 = 17/52
5)17/52 - 1 5/6 = 17/52 - 11/6 = 51/156 - 286/156 = - 235/156 = - 1 79/156
ОТВЕТ - 1 79/156