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Primary school mathematics: what's the first number? Is 0 ok?
Hello, this is immediate liberation, and I won't answer it for you:

Solution: Since it is only stipulated that it is primary school mathematics, in view of the standardization of the problem:

1, if it is within the range of natural numbers, the number of 1 before 2 is 1.

2. If it is within a positive integer range, it is the same as 1.

3. If the range is an integer, there is no solution.

4. If it is within the rational number range, there is no solution.

Thank you for your patience in reading. Please adopt it.

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