Need to understand the basic structure of the problem. This kind of question usually gives the relationship between two numbers, for example, A is 3 more than B or A is 4 less than B. This means that the number we are looking for is A or B, and the relationship between this number and another number is established by adding and subtracting a definite number.
If we ask for a number 3 more than A, we just need to add A and 3. Expressed by mathematical formula: A+3. Similarly, if we ask for a number less than 4, we need to subtract 4 from A and express it by a mathematical formula: A-4.
For example, if we know that A is 10, then the number 3 more than A is 13, and the number 4 less than A is 6. Similarly, if we know that B is 15, then the number two that is more than B is 17, and the number five that is less than B is 10.
This kind of problem can also be solved by algebraic method. We can set the unknown as x, and then set up an equation to solve it. For example, if we need a number that is 3 larger than A, we can set this number as X and then establish the equation: x= A+3. You can get the value of x by solving this equation.
The benefits of learning mathematics:
1, improve logical thinking ability
Mathematics is a subject that requires strict logical thinking. By studying mathematics, we can exercise our logical thinking ability. In the process of solving mathematical problems, we need to carry out various logical thinking activities such as reasoning, induction and deduction, which can help us better understand and analyze problems and improve our thinking ability and problem-solving ability.
2. Enhance the practical application ability.
Mathematics is a widely used subject, which can be applied to natural science, social science, engineering technology and other fields. By studying mathematics, we can better understand and solve practical problems. For example, in physics, mathematics is widely used to describe and explain physical phenomena; In economics, mathematics is used to establish and analyze economic models; In engineering, mathematics is used to design and optimize various systems.
3. Cultivate creativity and innovative spirit.
Mathematics is a subject that needs creativity and innovative spirit. By studying mathematics, we can cultivate our creativity and innovative spirit. In mathematics, there are many unsolved problems and conjectures that need us to explore and study. In this process, we need to give full play to our creativity and innovative spirit and put forward new ideas and methods to solve problems.