4+4+4+3 is rewritten as multiplication and addition formula is 4×3+3.
Four operations are simple and basic mathematical operations, that is, four operations of addition, subtraction, multiplication and division. Four operations are the important content of primary school mathematics and the basis of learning other related knowledge.
In mathematics, when the first-level operation (addition and subtraction) and the second-level operation (multiplication and division) appear in the same formula at the same time, their operation order is multiplication and division first, then addition and subtraction. If there are parentheses, the order of operations at the same level is from left to right. Such operations are called four operations.
The fourth refers to the calculation rules of addition, subtraction, multiplication and division.
The expressions of four operations do not necessarily have four operation symbols. Generally, it refers to the operation of combining the majority into a number with two or more operation symbols and brackets. Addition and subtraction are reciprocal operations; Multiplication and division are reciprocal operations; Multiplication is a simple operation of addition. Collectively referred to as four operations.
Matters needing attention in four operations:
1. If there is only addition and subtraction or only multiplication and division, it is calculated from left to right. For example, 2+ 1- 1=2, first calculate the number of 2+ 1, and then subtract 1 from the number of 2+ 1.
2. If primary operation and secondary operation (see inner chain) exist at the same time, calculate secondary operation first.
3. If there are primary, secondary and tertiary operations (i.e. power, root and logarithm operations) at the same time, first calculate the tertiary operation, and then calculate the other two levels.
4. If there are brackets, count the numbers in brackets first (no matter what level, count first).
5. The third level should be counted in brackets, and then the second and first levels should be counted.