1, number is one of the most basic concepts in mathematics. It is a symbol used to represent quantity, size and order. In daily life and scientific research, numbers are everywhere, such as calculation, statistics, measurement and so on. The size relationship of numbers can be determined by comparison, such as greater than, less than, equal to, etc. In addition, numbers can be added, subtracted, multiplied and divided, and these operations have their own specific laws and properties.
2. Numbers can be divided into natural numbers, integers, rational numbers, real numbers and other different types. Natural numbers refer to positive integers starting from 1, such as 1, 2, 3, etc. Integers include positive integers, negative integers and zero, such as-1, 0, 1 and so on. A rational number is a number that can be expressed as the ratio of two integers, such as 1/2, -3/4, etc. Real numbers include rational numbers and irrational numbers, such as π and √ 2.
Numbers also play an important role in computer science. Computers use a binary number system to store and process information, in which each bit can only represent two states: 0 or 1. By combining multiple binary bits, larger numbers and more complex data structures can be represented.
Stroke related knowledge
1. Stroke is the basic unit of Chinese character writing and one of the basic elements of Chinese characters. Each Chinese character consists of several strokes, and each stroke can be further decomposed into several basic strokes. In addition to the basic knowledge of strokes, there are some advanced themes related to strokes, such as calligraphy art, font structure and so on.
2. The strokes of Chinese characters can be divided into five basic types: horizontal, vertical, skimming, pressing and dot. Among them, the horizontal direction is to draw a horizontal line from left to right; Vertical means drawing a vertical line from top to bottom; Skimming is to draw a diagonal line obliquely from the upper right to the lower left; Si is a diagonal line drawn obliquely from upper left to lower right; A dot is a dot.
3. When writing Chinese characters, you need to pay attention to the order and direction of strokes. Generally speaking, write the first half and then the second half; Write the left part first, then the right part. In addition, you need to pay attention to the length and thickness of strokes, as well as the spacing and connection between strokes.