1-9, 9 digits, make up 3 3-digit numbers, among which 2 3-digit numbers are subtracted, but the numbers cannot be repeated

1-9, 9 digits, make up 3 3-digit numbers, among which 2 3-digit numbers are subtracted, but the numbers cannot be repeated

486 - 359 = 127
495 - 127 = 368
567 - 439 = 128
639 - 487 = 152
……