Elementary school math problem solving starts with the number 1-9.
There is no answer unless there is an accident. Only consider the position of 9, which is the maximum number. Theoretically, there are four positions that can be put, namely, the unit and tenth of the minuend, the unit and tenth of the difference. Moreover, since the difference is 8, there are only five cases in which the remaining number is expected to be reduced to 8. Well, in short, there is no substitute for trying.