I said I was in my third year of junior high school and I was anxious about my math

Mathematics is not a high score if you do a lot of homework, the key is to think actively, clarify your own thinking, the idea of the problem, no matter how the problem changes, it is around a certain center. There is also the need to believe in yourself, to build self-confidence for yourself, to believe that you have done so much practice, what is there to worry about in the exam.

Don't just think about how to do it, but learn how to analyze it, and when you analyze it, your score will go up.

Junior high school math is not difficult, if you are not good at math, is it a careless problem, you find out the reason why your math is poor, you take out the test papers you have done before to analyze which part you are mainly losing points in, our teachers often told us that the test papers are 60% of the basic questions, 30% of the improvement questions and 10% of the difficult problems.

And each mathematical formula you can always use very well, in fact, no matter how much the problem does, it may not necessarily help much, the problem can be exchanged for exchanges, the key is whether you have mastered the method of solving the problem, okay, this is just my personal opinion, for reference only. Take the test...

Doing questions is not down-to-earth enough, and earning points requires careful earning.

If you have a good mentality, you can do the questions well, not for speed, but for hit.

Junior high school mathematics should focus on the basics, and the test questions are all based on the knowledge points in the books, that is, they originate from the books and are higher than the books.

If the high school entrance examination is compared to building a high-rise building, then the first round of review is the process of "laying the foundation".

The first round of revision has two important roles: weaving a knowledge network and laying a solid foundation.

The structure of the exam paper is easy: medium: difficult =7:

The ratio of 2:1 accounts for 70% of the total score, so it is necessary to have a deep understanding and proficiency in basic mathematical knowledge. From the analysis of the examination questions in previous years, the basic questions still occupy the main position, even if it is the answer and the finale question, it is generally an extension and adaptation of the textbook questions, so some concepts, definitions, and theorems are not clear and must be checked in time to consolidate and strengthen the textbook.

What does it take to complete a review round successfully? The basic concept definition theorem is clear, the basic question types are successfully mastered, and you can find your own shortcomings and understand your mastery of each module, so a round of review is not only a process of comprehensive review of basic knowledge, but also a process of comprehensive understanding of yourself.

Specific measures are suggested:

1. Sort out the concepts, formulas, rules, and properties of each chapter clearly and memorize them firmly. At the same time, take a look at the knowledge structure diagram of each chapter, which can effectively deepen your memory.

2. Pass the practice questions at the end of the textbook one by one. When reviewing, we should firmly grasp the basics: start with the example questions and exercises in the textbook, and do each question by hand, don't look at the master and the low, the big questions will not be done, and the small questions will not be done.

The purpose of this practice is to make basic knowledge exercises so that they can be used to solve problems and consolidate basic skills. In this process, if you find that you have mastered the content of a certain section, you can skip this paragraph and review the following content. If you have already done a few questions in this area and still get it wrong, you need to intensify your review of this section.

Information**.

Summary. r=2

s=6*2/3=4

I have a question (junior high school mathematics).

Hello, what is your question?

Arc length = the radian of the central angle multiplied by the fan radius, because the radian of the central angle is known, you can find the vertical fan radius of the sedan car, in addition, the fan area is equal to the arc length multiplied by the radius and then close the shout big divided by 2, you can find the fan area.

r=2s=6*2/3=4

Compare the heart] [compare the heart] [compare the heart].

Thank you, teacher. Please give me a thumbs up, thank you

Already give you five small stars for the <>

Thank you, classmates.

1) Because x<-8, x+4<-4<0

So 4-change (4+x) squared

4-√(4+x)^2｜

4+(4+x)｜

x+8｜-x-8

2) If the square of the root number (3-a) = a-3 is true, then 3-a 0 is a 3

1 The absolute value of 4-(4+x) is 8+x

2 3-a less than 0 a greater than or equal to 3

It's so hard for the kids, go to sleep.

A single digit is 4 times the number of ten digits, can only be 14 or 28, 41 or 82 after conversion, 41-14 = 27, 82-28 = 54

So the original two-digit number is 28, and the new two-digit number is 82

Let the first one be x, then the next one is x+7, x+14, x+21, x+28

Add 5x+70=80 x=2 Friday 2nd then the 4th is Sunday.

Question 1: If the original two-digit ten-digit number is x, then the single-digit number is 4x, and the new two-digit number (10x+4x) is the original two-digit number according to the question (10x+4x).

Multiply 10 by 4x+x)—(10x+4x)=54 to get x=2

New two-digit = 82

Original two-digit number = 28

Question 2: Let the first Friday be the number x.

According to the title, x+(x+7)+(x+14)+(x+21)+(x+28)=80

The solution is x=2

The first Friday is the 2nd, and the 4th is Sunday.

1. It was 28 and now it is 82. Process: There are two such two-digit numbers, which are 14 and 28, which are easy to judge.

2. Sunday. Process: Let the first Friday be x, then the second, third, fourth, and fifth can be set to x+7, x+14, x+21, x+28 respectively, and now the equation x+(x+7)+(x+14)+(x+21)+(x+28)=80 can be solved, and x=2 is solved, that is, May 2 is Friday, so the 4th is Sunday!

Question 1: The numbers that meet the requirements are 14,41 and 28,82 As for the answer....Question 2: Number Sequence Solve that the second number is Friday and the fourth Sunday.

1. The original number is 28, and the new number is 82

2. Sunday (Friday is the 2nd).

1. Suppose the ten digits in the original two-digit number are x, and the single digit is 4x, then the original two-digit number is 10x+4x, and the new two-digit number is 10x4x+x, yes.

10x4x+x—（10x+4x）=54

x=2So, the original two-digit number is 28, and the new two-digit number is 82

2. Suppose the date of the first Friday is x, and the second Friday is x+7, and so on x+(x+7)+(x+14)+(x+21)+(x+28)=80x=2, because the 2nd is Friday, so we know that the 4th is Sunday.

In fact, junior high school math is very simple (if you go to high school, you will find that junior high school math can be understood as long as you listen carefully to class.) ）

1.First of all, you need to know what each chapter is about.

Here's a math syllabus** (I don't know which version you're learning, but it should be about the same.)

For example, a certain chapter, it is about geometry, what geometry? Plane geometry, so what does it mainly talk about? To the apex angle, to prove that the two triangles are congruent, to prove parallel, and so on...

Questions like that, ok, you know what it's about in this chapter (10 minutes can be done, right?). Then see how you can prove that two straight lines are parallel - two straight lines that never intersect in a plane are parallel lines, and so on.

Read the concept every day.,Pay attention to reading it every day.,It's not too much for you to get a book in half a month.,And then buy a tutorial book.。。。 Wang Houxiong is recommended here, although it may be a little difficult, but if you look carefully, your math can definitely go up...

Or a point, you have to learn to learn on your own, not necessarily listening to the teacher will be better than your self-study, I'm just giving such an example here, you can try it. But there's one most important point!!

The killer feature of learning mathematics is to do more questions, like when I took the high school entrance examination, those question types have been rotten by my junior high school year... It's basically the same as the original question, Eun, believe in yourself, it's still too late.

Actually, at the beginning. First, the second year of junior high school is not important, the third year of junior high school as long as you listen carefully in class, do more questions, several of my friends are outstanding after the third year of junior high school, and later there are some who won the top prize in the high school entrance examination, you also work hard!

Review, to repeat the key test points, if you want to learn things well in 2 years in one year, it is not easy, so just pick the key points. There is a question set for the three years of junior high school with zero mistakes, which is explained in great detail, as well as the hot topics of the exam in recent years. You can take a look at this book.

Also, don't think about tackling difficult problems at the last time, because your difficult problems are only 30 points, but the basic questions account for 120 points, and if you learn the basic questions well, then there will be at least 110. And the basic questions are very simple and easy to understand! Finally, I wish you success in your exams!

If you don't know how to do it in the first and second days of junior high school, it is recommended that you ask a tutor to help you make up for it.

I did my own calculations, and I did it in the middle of the night. The accuracy rate is not necessarily high, please look at the landlord.

As shown in my diagram, the perpendicular line gh crosses the point p at the point g, as dj ab, hf ab, and the straight line gh crosses at the point j and h, respectively.

Let the JP length be A and the GP length be B

EPQ DQM

dq=jp=a

eq=ahj=a

j is the midpoint of hp.

Easy to prove dm=b, bm=df=a

af=4-2a-b

Easy to prove eh=b

From RT AEF, tana=a:(4-2a-b); From RT ABC, Tana = 3:4, the ratio A: (4-2A-B) = 3:4 can be obtained

Sorting out this scale gives us a= ......

By RT HPE, Tan HPE=B:2A=34

Sorted out a=(2 3)b ......

Simultaneous and formula, can solve a, b

In RT HPE, the Pythagorean theorem calculates the EP length.

If I'm thinking correctly, I should be able to figure it out. I won't forget it. It's trapped me.

Why is EQN in a straight line?,Please prove it.,Don't look at the picture is correct.。。

It's not that simple, you can jump off the building, stupid, so stupid.

The topic of the third year of junior high school is simple? Think about it slowly! That helps.

So far, I have asked the first two questions, you can take a look first, and then ask me if you don't understand.

I don't know that geometry math problems can't just have problems without diagrams.

The headline of this kind of news is really inexplicable, whether it emphasizes the wanted criminals or the high appearance of the good looks, whether the bounty is a little higher, and the prize for catching the beauty is doubled! Of course, news reports should try to attract attention, but there should be a limit to this, and it should not be turned into an eyeball economy.

Is the last picture good, I can help you.