1.
10 3/5 : 1 3/6 = 53/5 : 9/6 = 53/5 * 6/9 = 106/15 = 7 1/15,
2.
8 13/15 - 1 6/13= (8 - 1) + (13/15 - 6/13)= 7 + (169/195 - 9/195)= 7 + 160/195 = 7 + 32/39 = 7 32/39,
3.
10 2/10 * 3 1/2 = 102/10 * 7/2 = 357/10 = 35 7/10,
4.
4 2/19 - (-2/3) = 78/19 + 2/3 = 234/57 + 38/57 = 272/57 = 4 44/57,
5.
-7 2/7 + 10 5/6 = -51/7 + 65/6 = -306/42 + 455/42 = 149/42 = 3 23/42