The symbol (a, b) indicates the smaller of the two numbers A and B, and the symbol [a, b] indicates that the two numbers A and B refer to the larger number with more shortcomings.
When you see the brackets, you will find the smaller of the two numbers, and the brackets will find the larger of the two numbers (-5,-0.5)+[-4,2] =-5+2 =-3.
Only blip (- 1, -3)+[-5, (-2, -7)]=-3+[-5, -7]=-3+(-5)=-8.
Knowledge expansion
Formula method is a method to solve mathematical problems, which uses specific formulas to solve problems. It is suitable for some specific mathematical problems, especially those with clear formulas or models to follow.
The general steps of the formula method are as follows:
1. Determine the type and requirements of the problem: You need to determine the type and requirements of the problem before solving the problem by the formula method. This can help you choose the appropriate formula and method to solve the problem.
2. Find a suitable formula: You need to find a suitable formula before solving a specific problem. This can be achieved by consulting mathematics textbooks, reference materials or searching related content on the Internet.
3. Understand the meaning and usage of the formula: Before applying the formula, you need to fully understand the meaning, usage and calculation steps of the formula. This can be achieved by reading the definition and examples of formulas and doing necessary exercises.
4. Substitute the known data into the formula: Once the applicable formula is found and its usage is understood, the next step is to substitute the known data into the formula. Pay attention to the correctness and accuracy of the data when substituting.
5. Calculation and answer: After substituting the known data into the formula, calculate according to the calculation steps of the formula. In the process of calculation, we must pay attention to the consistency of units and the accuracy of calculation.
6. Check the answers: After the calculation is completed, check the calculation results. Ensure that the answer conforms to the requirements and logic of the question and whether it conforms to common sense.
7. Summarize and explain the results: Finally, summarize and explain the calculation results in a correct way. Be sure to present the results in a clear and accurate way so that others can understand your reasoning and solving process.
Generally speaking, the formula method is an orderly and systematic method to solve mathematical problems. According to the above general steps, you can effectively apply the formula method to solve various mathematical problems. Remember, you must be careful when using the formula method to ensure that every step is correct and accurate.