105.
а)
(6 1/8 * 1 2/7 - 2 11/14 * 1 8/13) * 1 3/5 = 5 2/5,
1) 6 1/8 * 1 2/7 = 49/8 * 9/7 = 63/8 = 7 7/8,
2) 2 11/14 * 1 8/13 = 39/14 * 21/13 = 9/2 = 4 1/2,
3) 7 7/8 - 4 1/2 = 7 7/8 - 4 4/8 = 3 3/8,
4) 3 3/8 * 1 3/5 = 27/8 * 8/5 = 27/5 = 5 2/5,
б)
(2 7/15 + 1 7/12) * 1 1/9 - 1 7/8 = 2 5/8,
1) 2 7/15 + 1 7/12 = 2 28/60 + 1 35/60 = 3 63/60 = 4 3/30 = 4 1/20,
2) 4 1/20 * 1 1/9 = 81/20 * 10/9 = 9/2 = 4 1/2,
3) 4 1/2 - 1 7/8 = 4 4/8 - 1 7/8 = 3 12/8 - 1 7/8 = 2 5/8,
в)
(4 3/10 - 3 3/5 * 5/12) * 5/6 = 2 1/3,
1) 3 3/5 * 5/12 = 18/5 * 5/12 = 18/12 = 3/2 = 1 1/2,
2) 4 3/10 - 1 1/2 = 4 3/10 - 1 5/10 = 3 13/10 - 1 5/10 = 2 8/10 = 2 4/5,
3) 2 4/5 * 5/6 = 14/5 * 5/6 = 14/6 = 2 2/6 = 2 1/3