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Verification in mathematics
Strictly speaking, 3 and 4 are verified by the inverse operation of addition and subtraction and the inverse operation of multiplication and division, 1 is verified by repeated calculation, and 2 is verified by exchanging positions. As long as the results of the previous two calculations are the same, the purpose of checking calculation can be achieved. Therefore, these four methods belong to checking calculation, which can verify the correctness of the calculation.