123456789 is not used. Multiplication and division can only be added and subtracted. The number should be in order. The result is ten

1+2+3+.9=45
45-10=35
35/2=17.5
The sum of nine numbers is 45, which is 35 different from 10. That is to say, just change the + in front of the number whose sum is 17.5 to - sign. However, because all numbers are integers, it is impossible to have the number whose sum is 17.5, so this problem cannot be solved

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