The difference between Number Juexue 7-2 and 2-7 lies in the different operation results.

1, the number Juexue 7-2: 7-2 = 5, the number 5 is decomposed to get the number 5= 1×5=5× 1, that is, the number 5 can be expressed as the product of the number 1 to 9. So the result of the number Juexue 7-2 is/kloc-0 /×/kloc-0 /× 2× 3× 4× 6× 7× 8× 9 = 36288.

2. Mathematical Juexue 2-7: 2-7 = -5. Because the number Juexue requires a positive integer, the number -5 cannot be decomposed, so the result of the number Juexue 2-7 does not exist.