How to arrange math homework in three rows and five rows

1 and the number 1-9 are vertically arranged to form the number with the largest emission.

2. Divide the number with the second largest emission into two groups in sequence, one with three numbers and the other with two numbers.

3. Divide the number with the third largest emission into two groups in order, one group is three numbers, and the other group is one number.

4. Divide the number with the fourth largest emission into two groups in sequence, one with three numbers and the other with two numbers.

5. Divide the number with the fifth largest emission into two groups in order, one group is three numbers, and the other group is one number.