A great way to learn math well Help me thank you

Hello, I have had this question many times, I will talk about the method of learning science, I hope it will help you!

1. Pay attention to the pre-class preview, and if the pre-class preview is sufficient, you can listen to the class in a targeted manner, and focus on listening to the places that you don't understand in the preview, so that you won't be unable to keep up with the teacher's ideas, and you will save effort when you listen to the class. The habit of paying attention to the pre-study is necessary and must be adhered to for a long time in the study of science. It is recommended that you buy a textbook to analyze and learn synchronously, study more example questions and wrong questions, don't blindly do questions, if you don't study thoroughly, just doing a lot of questions will make you more and more tired, and your interest is not at all.

2. Pay attention to the content of the teacher's lectures, that is, to focus on the basic concepts taught by the teacher to understand, the meaning of each concept should be deeply understood, and the example questions taught by the teacher should be quickly sorted out to see what the difference is, if it is different, it is necessary to quickly judge whether it is right or wrong, if it is wrong, it is necessary to find the cause of the error, if it is the same, it is better to find other methods, and other methods to solve this kind of problem can be summarized recently. Don't think that the teacher will not listen to what he says.

3. Pay attention to the extracurricular homework left by the teacher, and be diligent in thinking and taking it seriously when doing homework, and dig out your own methods of solving problems 4. Practice a certain amount of exercises, the topics should be selected, and some typical topics should be selected.

5. It is necessary to pay attention to the summary of science chapters, connect scattered knowledge, and thoroughly understand and integrate the knowledge that is easy to confuse.

6. If you want to learn science well, it is not something that can be learned well in one or two days, you must be prepared to endure great hardships, because science is a subject that focuses on foundation, strengthening, and consolidation, and it is impossible to improve and learn science well without hard work.

When the teacher is in class, don't be deserted, write down the important content in the book, and ask the students around you who have good academic performance if you don't understand.

After a while, your grades will improve.

Mathematics depends on talent, in fact, it is useless to listen to lectures in class, and I still can't do those Olympiad numbers.

The circumference is meters.

So the radius is the meter.

The ratio of the planting area of various flowers is chrysanthemum: string of red: rose = 90:150:120 = 3:5:4

Flower bed area = square meters.

The area of chrysanthemums = (90 360) * the area of the flower bed = the area of the square meter of red bunches = (150 360) * the area of the flower bed = the area of the rose = (120 360) * the area of the flower bed = the square meter.

Chrysanthemum: 90 360 = 1 4 Bunches of red: 150 360 = 5 12 Roses: 120 360 = 1 3

So, chrysanthemum:string red:rose = 3:5:4

24 2 = 12 (m), 12 * 12 * square meters) 3 + 5 + 4 = 12, chrysanthemum: 3 12 * square meters), string red: 5 12 * square meters).

Roses: 4 12* sq.m.).

Answer: The area ratio is 3:5:4. Chrysanthemum square meters, red square meters, rose square meters.

You're doing your 6th grade math winter vacation homework, right?

It just saved me from typing so many words.

y=-1 2x squared - 2x

1 2 (x square + 4x).

1 2 [x square + 2x (2) + 2 square - 4] = -1 2 [(x + 2) square - 4].

1 2 (x+2) squared +2

In the first question, x is the range of the value of y when all real numbers:

Because, in any case, the square (x+2) will be positive, and its minimum value is 0

So, -1 2(x+2) squared must be negative, and its maximum value is 0(Positive and minus!) )

According to this, the maximum value of -1 2 (x+2) squared +2 is 2

Conclusion: y 2

In the second question, when -4 x 0, the value range of y:

Because, 1 (x+2) squared 4

1 (x+2) squared (x+2) squared 4

1 2(1)>=1 2(x+2) squared -1 2(x+2) squared" = -1 2(4).

3 2> = -1 2 (x + 2) square + 2 -1 2 (x + 2) square + 2 > = 0

So, 0 -1 2 (x+2) squared +2 3 2 Conclusion: 0 y 3 2

When you discover the wonders of mathematics, you will find it really interesting. If you are not good at math, you can try to study tutorial classes, as long as the teacher teaches you thoroughly, you will be of great interest.

I'm very good at math, but I mainly have to work my own, pay attention to listening to lectures in class, and review in time after class, that's all.

If it really doesn't work, then buy more extracurricular questions to do. Step by step, master your own problem-solving ideas. Also, don't be blinded by past failures and do everything well in the present.

This is true for every course.

If 12 corresponds to 3, 3 will correspond to 4

12 corresponds to 4, 3 corresponds to 3 is true.

13 corresponds to 3 2 corresponds to 4 Established.

23 corresponds to 3 1 corresponds to 4 True.

You misunderstand the mapping from A to B then when the function looks at it.

An x and a unique y solution, so there can be multiple correspondences in a to elements in b, and elements in b are not necessarily uniquely corresponding.

If, as you say, f(x)=x to the power of zero +2, there are three possible solutions that map 4.

There is no number that corresponds to 4, 3 and 4 must be there and correspond.

3 pcs. OK.

With the hypotenuse BC as the center, rotate the ABC counterclockwise direction to the Zen drain 90° to DEF, how to turn it. Isn't it centered on the BC midpoint attack?

The overlap is 12. It turned out that half of the silver had been accumulated.