This is just the limitation of thinking. Many people know it, but you can't figure it out, which means you think differently from others. You have to think about why others think so. You can only think like this. This is called inexperience, that is, your brain has less time to think about mathematics. As for others who do it fast, you do it slowly because you have no sense of numbers. This is a question of how much you do, that is, how familiar you are with mathematical thinking. Generally, after reading the question, you will know what the questioner wants you to do. Give a simple example:
Suppose: there is a class.
Event: The teacher taught the students to compare the sizes of two algebraic expressions by making a difference.
So, he gave an example: a> 1, which proved the size of A 2 and A.
Solution: ∫a2-a = a(a- 1)> 0.
∴a^2>； a
You can do it quickly because your thinking is clear. The teacher is teaching the difference method today. She will try her best to come up with a problem to be solved by the difference method. You can be sure that this problem is solved by the difference method.
So you should get familiar with how math problems are worked out, and you will naturally know how to solve them.
The expression ability is not very good, the speech is not very good, don't spray if you don't like it = =