Do the four operations calculate addition and subtraction or multiplication and division first?

Four operations, first parenthesis, then parenthesis, first multiplication and division, then addition and subtraction.

1, elementary arithmetic, the rule that must be followed is to calculate parentheses first, then parentheses, then multiplication and division, and then addition and subtraction.

2. Only by mastering the laws of elementary arithmetic can we operate correctly and be accurate.

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