1. Let the matrix A=ones(6)+magic(6). Sequentially, perform the following operations on A:

1. Divide column 6 by 10 and place the result in the fifth column.
2. Add the elements of the first row to the elements in the last row and store the result in the first row.
3. Multiply the elements of the first column by the corresponding elements of the fourth column and place the result in the fourth column.
4. Set the diagonal elements to 500.