684•397-584•397

To solve this problem, we can follow the order of operations: parentheses, multiplication, and subtraction.

First, we multiply 584 by 397:

584 * 397 = 231,848

Now, we multiply 684 by 397:

684 * 397 = 271,548

Finally, we subtract the result of the second multiplication from the first multiplication:

231,848 - 271,548 = -39,700

Therefore, 684•397 - 584•397 is equal to -39,700.