Step 1: 9 5 4 / 20 8 15= 1,080
Step 2: (4/9) / (7/10) / (8/3)= (4/9) (10/7) (3/8)= 0.17857
Step 3: 9/10 5/33 9/16= 0.0021
Therefore, the final result is:1,080; 0.17857; 0.0021
Step 1: 9 5 4 / 20 8 15
= 1,080
Step 2: (4/9) / (7/10) / (8/3)
= (4/9) (10/7) (3/8)
= 0.17857
Step 3: 9/10 5/33 9/16
= 0.0021
Therefore, the final result is:
1,080; 0.17857; 0.0021