1, operation sequence is a mathematical term. In mathematics, when adding, subtracting, multiplying and dividing, the default calculation order is made by people. Mainly power first, then multiply and divide, and finally add and subtract. If there are brackets, the calculation in brackets should be carried out first.

When calculating at the same level, according to the position from left to right. Besides addition and subtraction, the order of operations can be changed. Except for integers, the calculation of decimals, fractions and rational numbers is carried out in this operation order.

2. Mathematically, operation is a behavior, and a new quantity is obtained through possible combinations of known quantities. The essence of operation is the mapping between sets. Generally speaking, operation refers to algebraic operation, which is the correspondence in a set.

According to mathematical rules, the process of substituting or transforming quantities and finding the result of expressions. It is the main content of mathematics research, and mathematics is the subject of studying quantity and its operation, graph and its transformation. The most basic operation of numbers is four operations. Each operation has its own suitable algorithm.

3. While studying numbers in mathematics, arithmetic is also defined, and the new arithmetic expands the category of numbers. Negative numbers represent the concepts of lack, deficiency and debt in practical sense, and the algorithm for generating negative numbers needs to be improved.

For example, what rules are used to calculate the addition, subtraction, multiplication and division of positive and negative numbers? These laws are defined according to the actual situation and can be used as axioms.

Precautions:

1, the first thing to note is that continuous addition is not a new addition. It's not new. It is not a new addition, but an increase on the original basis. Addition is addition, there is only one kind, that is, the addition of two numbers. Although continuous addition is the addition of three or more numbers, it is not a new addition.

2. Second, pay attention to writing. Since addition is addition, why not write according to the original style of adding two numbers, but use this addition style? Parents should also let their children know this. In fact, the addition formula of three numbers was originally changed from the addition formula of two numbers.