1, relative number, also known as "relative number", is a comprehensive index that reflects the quantitative characteristics and quantitative relationship of social and economic phenomena by comparing the ratio of two related indicators.

2. The relative index is also called relative number, and its value has two forms: the unknown is an abstract value, which is mostly expressed by coefficient, multiple, fraction, percentage or one thousandth; A composite number consists of two or more famous numbers. Relative number, also known as relative index, is a statistical index formed by comparing two interrelated indexes.

3. Its specific value is relative number, which is used to reflect the quantitative contrast between phenomena and within phenomena. Usually expressed in percentage (%), one thousandth (‰), coefficient or multiple, etc. There are three commonly used relative numbers: strength relative number (ratio), structure relative number (composition ratio) and relative ratio.

4. The meaning of speed refers to the frequency or speed of a phenomenon, such as birth rate and death rate. The structural relative number reflects the proportion of each component in a thing, such as the proportion of boys and girls in a class; Relative ratio reflects the quantitative relationship between two interrelated indicators by comparing them.

The concept of mathematics is as follows:

1. Mathematics is a subject that studies concepts such as quantity, structure, change and space. It is a science with strict logic and strong abstraction, and it is also a basic tool widely used in natural science, social science, engineering technology and other fields. The basic concepts of mathematics are number, operation, function, equation, inequality, sequence, set, space and so on.

2. These concepts constitute the basic framework of mathematics and provide theoretical support for solving various practical problems. Number: One of the most basic concepts in mathematics is the description of the quantity and order of things. Numbers can be divided into natural numbers (positive integers), integers, rational numbers, real numbers and complex numbers.

3. Operation: the process of operating logarithm, including addition, subtraction, multiplication, division, exponent, logarithm, etc. Arithmetic is the basic law in mathematics, which ensures the rigor of the mathematical system.