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Doctoral subject mathematics
This number is 1234. If you add a decimal point after a certain value, it can only be the last acceleration and deceleration point. Because there is only one decimal place after the decimal point, it is impossible to add a decimal point to the ten digits, a decimal point to the hundred digits, and then three decimal places, so only one decimal point can be added. Add a decimal point to this number, the result will be ten times less, and the original number will be doubled. Or this number divided by 1. 1 is the original number.