8½m=3целых 2 третьих*1 целая 1 одиннадцатая y: 4/5=3⅛: 1¼ z: 3/14=1¼

1 8/11 + 2 2/19 * ( 1 4/5 - 2 3/4) = 
1 4/5 - 2 3/4 = 9/5 -11/4 = 36/20 - 55/20 = -19/20
2 2/19 * ( -19/20) =  40/19 * 19/20 =  - 2
1 8/11 + ( - 2 ) = 19/11 -2 = 19/11 -22/11 = -3/11