How did the answer to the first question come from 150 60 t 4 ???? What is the meaning??? Please el

First of all, I think the answer is problematic, because time is x, so let's use t to explain it to you.

The car has two states, one is driving from A to B and one is driving from B back to A.

The first point is how long it takes to get from A to B, and it can be obtained from the question that it is 3 hours, that is, 0 3 hours, the car is on the way from A to B. (I think it should be 0 t 3 here).

The second point is to consider staying in B for another hour, that is, within 3 or 4 hours, the car is in B. (I feel like y=150 3 t 4 should be added here.) ）

Third, which is the difficulty, first of all, the speed from B to A is 60, that is to say, the hour after leaving B is to A, because B is from the fourth hour, so it is 4 t, and the first 4 hours the car is from A to B, or stop at B, so the time after leaving B should be subtracted from the first 4 hours, that is, T-4. The distance traveled by the car in this time period (4) is the speed * time, i.e. 60 * (t-4). At this time, the car is driven from B to A, and the longest is 150, and as the car travels, the distance between the car and A should be the total distance - the distance traveled by the car, that is, 150-60*(T-4).

It took 3 hours from A to B and 1 hour to stay, so it was already 4 hours when I departed from B to A.

Mathematics is a fundamental subject.

It's an arithmetic tool.

Down-to-the geometry measurements.

Avenue aerospace, all use mathematics.

At the same time, mathematical logical thinking.

Changed the way we think.

The main reasons are as follows: First, mathematics is very useful. In daily life, in industrial and agricultural production, and in scientific research, mathematics is inseparable.

Second, learning mathematics and using mathematics can make people more and more intelligent. Improve numeracy and develop intelligence. Wait a minute.

Hello: Mathematics is the foundation of all natural sciences.

If you don't study mathematics well, what physics, chemistry, medicine.

Biology, economics, and other subjects may not be studied well.

In fact, mathematics is a very important subject. It is rarely used in daily life, and it will be applied to the production practices of society. It covers a very wide range:

Accounting, budgeting, accounting, finance, military, and even aerospace also use mathematics. Some people say that there is no science without mathematics.

The addition, subtraction, multiplication and division of mathematics can be understood by us in society at a certain age. Learning math is learning the way of thinking. For example, Warroen - the co-ordination approach; the application of matrices; How to do multiple-choice questions, how to eliminate them, and so on.

I'll start with a general remark. First of all, there are two kinds of logic in terms of connotation: formal logic in the narrow sense and dialectical, deductive, and analytical logic in the broad sense, ......Wait a minute.

Therefore, when we mention logic, we often refer to a certain kind of logic. For example, after completing the high school course of mathematics, you will learn and exercise the logical thinking ability and expression ability of formal logic, deductive logic, judgment logic, analytical logic, computational logic, graphical logic, and so on. Secondly, it is said that learning mathematics can exercise logical thinking, which depends on whether you study seriously or not, and secondly, it depends on which aspect of logic you are referring to.

It's impossible that you don't study hard and learn logic well; It is impossible to graduate from college and learn all the logic thoroughly.

You said you were good at math, but you didn't notice that your logic skills had improved. On the one hand, it shows that you are not clear about the classification of logic and what logical ability can be improved by learning mathematics; On the other hand, you may not have learned the part that will improve your abilities, or you may not have the vision to "find yourself improving".

1. Watching detectives can exercise logical thinking skills, which is true. But is it necessary for everyone to take this course? Is it necessary to have a detective course?

You tell me? This course has a huge and complex content, involves a wide range of knowledge, and the use rate in daily life is not high......Is it necessary to place this heavy burden on each student? You say that detective learning is more interesting than math, and that's because you didn't get into it, and you didn't taste the sweetness of learning math.

2. When it comes to whether the ancients did not learn mathematics, whether they had the ability to think logically should be viewed from two aspects. First, it cannot be said that the ancients did not study mathematics, but it can only be said that mathematics was not popular in ancient times and was not a compulsory subject for students who went to school. That is, the preconditions you mentioned, which do not really exist.

Second, even if the ancients did not study mathematics, no one can say that they did not have the ability to think logically. Because whether there is an ability or not, there is not only one way to go to school and learn. It can only be said that if you don't learn mathematics, your logical thinking ability will be poor or even lacking; It is difficult to get exercised and improved because of the ability.

3. The learning method in the West is different from ours. They use encouragement, guidance, and heuristics more often. This learning method is conducive to arousing students' interest in learning, consciously learning, and even innovation, invention, and discovery.

So, when you mentioned that Western countries are lax in their learning, and students are not stupider than us, it's hard to say how much value that you say. Because you can't say that they are loose from the appearance of doing less homework. They just grasp learning in a different way than we do.

4. You say "I personally think .......""These are your own conjectures, how do you prove to be true? Even if it is true, it is not wrong for the country to want to improve its national strength and grasp the math scores of students. But if you imagine that ** uses the pretext of "learning mathematics can improve logical thinking ability" to deceive everyone, it is impossible, because this kind of deception is very inferior.

If mathematics can't improve logical thinking skills, how can he rely on fabrication to deceive people.

It is an indisputable fact that learning mathematics can improve logical thinking skills. It's just that not everyone can learn it, and not everyone can use advanced mathematical knowledge.

It's been a long time since I've answered the questions, so let's talk about them one by one. First of all, in the West, since ancient Greece, mathematics has not been counted as a science and engineering discipline, but is classified as philosophy, after graduating from a university mathematics major, you get a bachelor's degree in philosophy, not an engineering degree, philosophy is greater than science and engineering, philosophy is used to treat the whole world, and the probability of applying to the role of mathematics is reduced, so it is normal when you feel that mathematics is useless. And then about the detective class, the logical thinking in it is also based on the dialectical relationship established on the basis of mathematics.

No one said that our ancients didn't learn mathematics, no matter how much they talked a day, they still had to know basic addition, subtraction, multiplication and division, but because they learned too shallowly, logical thinking existed but there were very little. This can be seen from our history, the 2,000-year-old feudal history is only the result of relying on the sky to eat, and in the end it is so casual when facing the world. It should be said that the West does not attach importance to ideological and moral education (only 1 4 in our country are ideological education, except for the DPRK).

For math, they just don't ask us to memorize as many tricky questions, but learn a way of thinking. Finally, you said that Han Han == Actually, you can see a little in-depth **, such as the literary works mentioned at the head of Han Han's book.

As for him, he is completely in line with the absolutely inadequate characteristics of the Balance brain (you are interested in him may just be that you hate the language exam as much as he does), and will only scold everywhere and pretend to be innocent all day long, but in the end, no matter how much he scolds the language test-taking education (even if he is not wrong), he can only scold some superficial phenomena that everyone can see. That is, the essence of the problem cannot be found, let alone the solution.

The child's logical thinking ability is very good.

Strong, not only in math grades, but also in the whole habit of thinking affects all aspects of life:

Children with strong logical thinking skills tend to have strong judgment, be able to make their own ideas, and have their own opinions;

Be able to flexibly apply the knowledge learned in life and draw inferences from others;

Be more objective and be able to think about problems from multiple perspectives.

Learning mathematics and physics can exercise people's logical thinking, but high scores in mathematics and science are not necessarily proportional to the strength of logical reasoning ability.

Yes, three-dimensional geometry can exercise people's spatial imagination and spatial analysis ability, and further promote logical thinking.

Mathematics should exercise everyone's rigorous thinking ability, because in mathematics, most of the results are determined, and mathematics is a logical discipline, which is based on the logical system and has a strict structure. For example, in the eyes of physicists, infinite series are generally not considered to converge as long as they are useful; But mathematicians will never allow unconvergent infinite series to perform certain operations In contrast, physical chemistry and other disciplines are based on experiments, and of course they also need a logical system, but the logic there can be overturned at any time.