What is the use of doing mathematical logic reasoning problems

Why not ask a broader question – what's the use of doing math problems?

If it is said that the questions are done entirely for the exam, then there is nothing to say, and this is indeed the case when I was a student.

But if there is any use for anything other than exams, this should be the crux of the matter. Even if you do countless problems, you may not encounter the same problems in real life for you to solve. From high school to college, the integral derivative of advanced mathematics, the mathematical analysis of Fourier series Laplace equations, and so on, if you want to use them directly, you have to go to the teacher or do research.

If you can't use it, why do you need to learn it? Math isn't just about doing problems, and before you know it, it changes your thinking habits. In foreign countries, students who have studied mathematics in universities are very popular, because generally speaking, they have a strong sense of logic, careful thinking, and thoughtfulness, and these abilities are quite important in real life.

From this point of view, the logical reasoning questions are obviously of great significance. This kind of problem is generally interesting, closer to real life, can cultivate a sense of logic well, and this kind of problem can be done by anyone, not necessarily a person who studies mathematics.

Of course, everything has to be practiced for a long time, and it is almost impossible to say that the ability to do a few questions will go up.

Exercising logical reasoning ability can exercise rigorous mathematical logical reasoning ability and develop comprehensive logical ability!

Question conditions: Only one person told the truth.

It was noted that the statements of A and B were contradictory.

Among them, there must be one true and one false, and it is impossible to be true and false.

Then the words of C must be sooner, and those who are slow are falsehoods.

Reverse deduction can be obtained to be the chair of C repair.

Further, A has spoken a false and B has told the truth.

The chair in the classroom was broken, and the next day I went to school and was sleepy, and the teacher found that the chair had been repaired. It was understood that the chair was repaired by one of the three people, A, B, and C, and the teacher found these three people.

A said, "It was done by B." ”

B said, "I didn't do it." ”

C said, "I didn't do it." ”

Upon investigation, only one of the three told the truth. Please use reasoning to find out who built the chair?

Reasoning with hypothetical premises to rule out contradictions.

Suppose A tells the truth。That is, it is done by b. Then: C is a lie, and the opposite refers to C doing it. Contradictions,The assumption is not true

Suppose B tells the truth。That is, it is done by A or C. Then:

A is a lie, which means that B did not do it; Wang Shu C is a lie, and the reverse refers to the fact that it is done by concealing and C. The assumption is true,c do

Suppose C tells the truth。That is, A or B did it. then: A is a lie, which means that B did not do it; b is a lie, and the opposite is that b did it. Contradictions,The assumption is not true

To sum up: it is done by C.

My Thoughts: Observe the white pieces of the five figures.

In order, they are axisymmetric, center-symmetric, axis-symmetrical, center-symmetric, and axisymmetric.

So the next white piece is centrally symmetrical, choose A

I count the white seeds: the previous row has 10, 12, 13, 15, 12, a12, b17, c13, d13

Look at the trend of increase and decrease: increase first and then decrease, so choose the minimum value of ABCD A

The brain hole is a bit big, and it's not clear for the time being