108.
3)
2 3/10 : (5 2/3 - 3 3/4) + 7/19 * 2 5/7 =
23/10 : (17/3 - 15/4) + 7/19 * 19/7 =
23/10 : (68/12 - 45/12) + 1 =
23/10 : 23/12 + 1 =
23/10 * 12/23 + 1 =
12/10 + 1 =
1 1/5 + 1 = 2 1/5,
110.
3)
2 1/2 * 48 + 3 2/3 : 1/18 + 5 5/12 : 7/36 =
5/2 * 48 + 11/3 * 18 + 65/12 * 36/7 =
120 + 66 + 27 6/7 = 213 6/7,
4)
13 1/2 : 1 1/3 + 16 1/2 * 1 5/11 + 19 1/4 : 4/25 =
27/2 : 4/3 + 33/2 * 16/11 + 77/4 : 4/25 =
27/2 * 3/4 + 33/2 * 11/16 + 77/4 * 25/4 =
81/8 + 363/32 + 1925/16 =
10 1/8 + 11 11/32 + 120 5/16 =
10 4/32 + 11 11/32 + 120 10/32 = 141 25/32