1, the known distance is 3, and the position of the known point on the number axis is 2. According to the relationship between distance and position, we can get the number represented by the point: 2+3=5. Therefore, the number represented by the dot is 5. To find a point on the number axis, we need to know its distance from the origin and its position on the number axis.
2. Suppose we know that the distance from a point to the origin is d, and its position on the number axis is positive or negative. We can find this point according to the following steps: find the origin on the number axis. According to the position of a point on the number axis, determine whether it is in the positive or negative direction.
3. According to the relationship between distance and position, calculate the value represented by this point. If the point is in the positive direction, the value is positive; If the point is in the negative direction, the value is negative. Mark this point on the number axis and mark the value it represents. Through the above steps, we can find the point on the number axis that represents the numerical value.
The importance of mathematics
1, mathematics is the basis of understanding the world. From physics, chemistry and biology of natural science to anthropology, economics and psychology of social science, mathematics is providing us with tools to deeply understand the world. Through mathematics, we can better explain phenomena, predict the future and solve problems better.
2. Mathematics is the key to solving problems. In many practical applications, we need to use mathematics to model, analyze, optimize and make decisions. For example, in the medical field, mathematics can help us make accurate diagnosis and treatment; In the field of engineering, mathematics can help us design more efficient and safer buildings and equipment.
3. Mathematics is also a kind of culture. Mathematics has been shaping our civilization since ancient times. It not only helps us to understand the laws of the world, but also stimulates our curiosity and innovative spirit. By studying mathematics, we can cultivate logical thinking and abstract ability and improve comprehensive quality. Mathematics is an important force to promote the progress of human society.