Numbers and the operation of numbers, how to calculate the number in mathematics?

Does the prescription count as an arithmetic method?

I'm only in first grade, no. Don't look for me.

Just open the square, or check the square root table.

ab= a· b(a 0b 0), this can be used interchangeably, at most for simplification, e.g.: 8= 4· 2=2 2.

a／b=√a÷√b（a≥0b＞0）。

a²=|a|(Actually, it is equal to the absolute value). When a 0, a = a (equal to itself), when a = 0, a = 0, and when a 0, a = a (equal to its opposite).

For example: 18= (9x2) 9x 2=3 2 72= (36x2) 36x 2=6 2.

Writing specifications. The writing of the root number is exactly the same in the printed and handwritten fonts, and only the handwriting specifications are introduced here.

1. Write the root number.

First draw a short diagonal line to the upper right corner in the middle of the grid, and then continue to draw the lower right middle diagonal line with the strokes, and then draw a horizontal line of moderate length according to your needs near the top of the grid, and then make up for it if it is not enough.

2. Write the number or formula of the square to be opened.

The number or algebraic formula to be opened is written in the area enclosed by the right side of the V-shaped part on the left side of the symbol and the lower part of the horizontal part above the symbol, and cannot go out of bounds, if the number or algebraic formula of the square is too long, the upper horizontal must be extended to ensure that the open square or algebraic formula below is covered.

3. Write the square number or formula.

N to the nth power is written on the left side of the symbol, and n can be ignored when n=2 (square root), but it must be written if it is a cubic root (cubic root), a fourth square root, etc.

Hello, for your question, I guess what you want to ask should be how to do the open square calculation of non-square numbers.

For such issues, it can be adopted"Left and right approaching"Methods (Freshman Advanced Mathematics): i.e. a 2 < 7<3

This is how it can be solved.

In addition, in the stage of reform and opening up, China generally uses this method in the field of industrial machinery manufacturing to calculate the size of parts, and there is a specific square table, the advantage is that you can quickly read the manual for inquiry according to the required accuracy (number of decimal places).

Just open the square, or check the square root table. For example, the full square number is directly squared, for example.

And some can only be looked up in the table. For example, 2=

A number such as y, if you square the absolute value of x, you get a number like y, and you get x by putting y.

It is to find the arithmetic square root of a number. Square this number.

"Numbers and operations" refers to understanding the consistency of integers, decimals, fractions, and meanings while understanding the consistency of integers, fractions, and fractions based on the expression of counting units. Consistency is mainly reflected in: maintaining consistency, opening up as a whole, and advancing along the core.

Cognitive consistency of number: number is the abstraction of quantity, and the concept of number is essentially empty and cautious, and the number sense and symbolic consciousness are formed.

The consistency of the operation of numbers: the operation and the relationship between the operations, the understanding of the consistency of the operation of numbers, the formation of computing ability and reasoning meaning; Consistency of number expression: number of counting units + counting unit; Consistency of the expression of number operations:

The core concept of "accumulation" of the same counting unit is the counting unit.

The operation of numbers, mathematically, is the act of obtaining a new quantity by slowing down the possible combinations of known quantities. The essence of an operation is a mapping between sets.

Generally speaking, operations refer to algebraic operations, which are a kind of correspondence in a set. For a pair of elements a and b in set a, there is a third element c that is determined by the only scramble in set a and corresponds to them, which is called set a.

For example, the addition 5 + 3 = 8 in arithmetic, where 5 and 3 are the inputs, 8 is the result, and the plus sign "+" indicates that it is an addition operation. This is a common binary operation that is essentially a mapping in the form of a b c. Other common operations include absolute values, trigonometric functions, inverse trigonometric functions, logical non, and so on, which are unary operations that are essentially a b-form foreshoot.

Algebraic operations are all binary operations. There are many examples of binary operations. addition, subtraction, multiplication, division, multiplication, square, logarithm between numbers and numbers; intersections, unions, complements, differences, Cartesian products between sets; Logical and, logical, or, etc.

These operations can be seen as the role of "operators". The so-called operator can be regarded as a function symbol that acts on an operation element. For example, the operator of subtraction operation is the minus sign -, the operator of the square operation is the root number, the operator of the derivative operation is d dx, and the operator of the integration operation is the integral sign.

Generally speaking, operations refer to algebraic operations, which are a kind of correspondence in a set. For a pair of elements a and b in set a, there is a third element c that is uniquely determined in set a and corresponds to them, which is called set a, and an operation is defined in set a.

From this operation, two operations can be obtained, that is, one of a and b is regarded as what is sought, and c is regarded as known, and the operation obtained in this way is called the inverse of the original operation.

For example, if addition is the operation of knowing a and b, and finding a+b=c, then the operation of knowing a and c, finding b, or knowing b and c and finding a, is the inverse of addition, which is called subtraction.

In the four mixed operations, addition and subtraction are called the first (first simple hunger) operation, multiplication and division are called the (second) operation of the block, in an equation without parentheses, if there is only the first or second level of operation, it should be calculated in the order (from left to right), if there are two levels of operation, it should be calculated first (second level) operation, then (first level) operation, if there are parentheses, it should be calculated first (in parentheses).

Divide two natural numbers, the quotient is 7, the remainder is 8, the divisor is at least (9), and if the divisor is 14, the dividend is (106).