123456789 is equal to 24 by addition and subtraction

The sum of 1 to 9 is 45, 45-24 = 21
Plus and minus one plus and minus one plus and minus two times
21/2=10.1
The remainder 1 cannot be divided by 2
Therefore, the results of addition and subtraction from 1 to 9 are not even
So the original question does not hold

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