Verified answer

1. х=3.5*4.8/2*4=16.8/2.4=7

2. х=(2 целых 1/3)*9.2/2.3=7*92/(3*23)=7*4/3=28/3=9 целых 1/3

3. х=(7.2*4 целых 1/3)/2.4=3*4 целых 1/3=12 целых 3/3=13

4. (4 целых 2/7):(2целых 1/7)=30/7:(15/7)=30*7/(7*15)=2

3.2/х=2

х=3.2/2

х=1.6