Verified answer

1)11,9-1 4/5*1 1/3

119/10-9/5*4/3

119/10-3/5*4

119/10-12/5

19/2=9 1/2 ;9,5

2)16 1/2:11+9 1/6

33/2*1/11+55/6

32/3=10 2/3

3)(83,2-80 1/6)*3/13

(416/5-481/6)*3/13

91/30*3/13

7/10=0,7

4)(0,28+1 1/3):11/30

(7/25+4/3)*30/11

121/75*30/11

11/5*2

22/5=4 2/5