Решение (18 1/4-17 5/6)*8 4/10+ 6/10=

(18 1/4 - 17 5/6) * 8 4/10 + 6/10 = 4,1

1. 18 1/4 - 17 5/6 = 18 3/12 - 17 10/12 = 5/12
2. 5/12 * 8 4/10 = 5/12 * 84/10 = 42/12 = 21/6
3. 21/6 + 6/10 = 105/30 + 18/30 = 123/30 = 4 3/30 = 4,1