( 3 - 3,8 : 5 2/11 ) х 3/17 + ( 18 - 8 2/3 ) : 1 1/6
3,8 : 5 2/11 = 38/10 : 57/11 = 38/10 х 11/57 = 209/ 285 = 11/15
3 - 11/15 = 3/1 - 11/15 = 45/15 - 11/15 = 34/15
34/15 х 3/17 = 34/85
18 - 8 2/3 = 18/1 - 26/3 = 54/3 - 26/3 = 28/3
28/3 : 1 1/6 = 28/3 : 7/6 = 28/3 х 6/7 = 8
34/85 + 8 = 8 34/85
(13 2/7 : 31/70 -28,5) : 6,75 + 20 2/3 -19 9/10
13 2/7 : 31/70 = 93/7 х 70/31 = 30
30- 28,5 = 1,5
1,5 : 6,75 = 0,22
0,22 + 20 2/3 = 22/100 + 62/3 11/50 + 62/3 = 33/150 + 3100/150 = 3133/150
3133/150 -19 9/10 = 3133/150 - 199/10 = 3133/150 - 2985/150 = 74/75