Math problems, if you can t do it, you won t get a perfect score!

Let the triangle AEP be an isosceles triangle and AE=PE

bc‖adbe=qe

ae-be=pe-qe

AB=PQB point is perpendicular to AD. Vertical ad to f

The Q point is perpendicular to the AD. Perpendicular to G

af=ad-bc=18-12=6

fg=qb=1×t=t

abf≌△pqg

pg=af=6

dp=2×t=2t

dp+pg+gf+af=ad=18

2t+6+t+6=18t=2

bc‖adbe=qe

ae-be=pe-qe

AB=PQB point is perpendicular to AD. Vertical ad to f

The Q point is perpendicular to the AD. Perpendicular to G

af=ad-bc=18-12=6

fg=qb=1×t=t

abf≌△pqg

pg=af=6

dp=2×t=2t

dp+pg+gf+af=ad=18

2t+6+t+6=18t=2

LS seems to be only part of the correct answer

There is another solution to t, that is, when point p moves outside the line segment AD, and point Q has not passed point C, in this case, the length of AP can be easily solved by using the two conditions of triangle BCE and AEP similarity and isosceles, and then T=9+1 3 is obtained

To add, after solving this situation, it can be found that after point Q passes point C, it is impossible to form an isosceles triangle, so there is no need to solve it.

<> perfect score in math is not accidental, how to catch every mistake and keep improving? There is no other way to learn mathematics by practice. Mathematics is a special course that requires learners to have a certain degree of logical thinking and rigorous deduction.

Mathematics is different from Chinese, Chinese requires daily accumulation, and mathematics requires daily practice. In other words, the improvement of Chinese scores depends on long-term efforts, while the improvement of mathematics scores depends on necessary practice. In other words, math is easier to score with effort.

I remember a top student in the college entrance examination said that there is no other way to learn mathematics, as long as you complete the exercises that can be bought on the market, the college entrance examination mathematics is as easy as a finger. Similarly, children's math scores cannot be improved, and the main problem is still in practice. To get a good score in mathematics, you must complete at least all the questions in the textbook, all the questions in the matching workbook, and a set of tutorial workbooks that you have purchased.

Although the sea of questions tactic has been criticized, it is indeed very useful in the study of mathematics. If you want to improve your child's math score, it is not enough to just do homework, but you still need to take the initiative to practice, and you must practice a lot. Mathematics is a very fundamental subject.

What you said about children's academic performance is not up or down, there must be some knowledge that is not very solid, it is recommended that parents look at their children's exam papers and analyze the reasons for their children's poor grades? For example, which part of the knowledge is it? Or which type of question?

Or is there a deficiency in the child's learning habits and learning methods? These problems are solved, and I believe that the child's grades will definitely improve greatly. Some people are equipped with mathematical talents, and if they don't, they have to work hard:

First of all, it is very important to understand the knowledge of mathematics, preview before studying, listen carefully to the teacher's lectures when studying, and review carefully after class. Complete homework independently within a limited time, and take a good look at the textbook for those with vague knowledge, but I really don't understand asking teachers or classmates. After learning a chapter, close the textbook, sort out the knowledge, and think about what you have learned.

Do more exercises to see which knowledge is not firmly grasped enough, the problem is **, and strengthen the training in these aspects.

If you want to get a perfect score in mathematics, it can be said in elementary or junior high school that as long as you are willing to work hard, lay a good foundation, and correct every mistake is very possible, and in high school, you need not only hard work, but also talent, but if you want to get a high score, then how to catch every mistake and keep improving?

First of all, it is inevitable to lay a good foundation

For mathematics and other subjects, logic and thinking are very important, and the most important thing is to lay a good foundation in order to be further improved. You can't blindly carry out the tactics of the sea of questions, you must find the wrong points and missing knowledge points to supplement and master, in fact, the difficult questions are based on the basic knowledge points, and they change. If you don't master the basics, it's hard to improve.

Second, learn to draw inferences

For mathematics, it is not good to master a knowledge point, because it is very logical, for the wrong place, occasionally change the style, add a little confusing things, this knowledge point, and do not understand, so we must learn to use some knowledge points, try to solve problems by ourselves, and then practice by ourselves. This is a good way to exercise thinking.

Then, learn to summarize

In each practice, you must learn to summarize the wrong questions. Find mistakes, analyze problems, take notes on mistakes, repeat and study, otherwise the next time you encounter a question, the wrong thinking pattern will be misleading.

Finally, the question sea tactics

When the previous ones are all done, you can start to carry out the sea of questions tactics and slowly improve the score.

I think that every mistake should be written down in a notebook, to find out the cause of the mistake, and it takes practice to be able to keep improving.

Collect and record every mistake you make. Flip through this book before the exam, recall that you made a mistake last time, and learn a lesson.

Use the notebook to write down each mistake that occurs, and analyze and reflect on it to make sure you don't make a mistake in the same place next time.

In a mathematics paper, basic questions generally account for 50%-70%, medium questions 10%-20%, and difficult questions 5%-10%. Dear, just because you can do the difficult questions doesn't mean you will do the basic questions. You can do math problems, which means that you love to study difficult problems, but you don't get a high score when it comes to exams.

Description: 1 You don't have a solid foundation or don't do the questions carefully, and the fact that you can do difficult problems does not mean that the foundation is easy to score, and the basic questions often test the mastery and carefulness of the basic knowledge, and the basic questions are especially easy to test the places that students do not pay attention to, such as the use of formulas, the ideas of solving problems, and even the specifications of solving problems. 2 For the mastery of time, the questions are generally the last two questions of the test paper, and if you answer all the questions correctly and all of them, it means that you have spent a lot of time on the difficult questions, and may even account for one-third of your exam time.

So you have to arrange the time reasonably, don't hold on to the difficult questions, even if you do all the problems correctly, it is only 20 points, but you have 15 points for the 3 basic questions.

Win the basic questions and sprint to the medium questions. Fight for the puzzle.

Because you are not careful, often because you are careless, you get easy questions wrong.

The problem will be, whether it can be done right. If there are any mistakes in the simple questions, reflect on them yourself.

It's not complete, or it's just that some key score points are not written.

It must be an incomplete step!

Pay attention to the process and the details.

Process Usually look at the standard answers and see how the full score answers are written.

Think of it this way:

1. This question should be answered by the same amount (the total amount of money of the two brothers).

2. According to the inscription "The amount of money of the younger brother is the 4 5 of the elder brother", it can be known:

It turns out that the younger brother's money: the elder brother's money = 4:5 Then, the elder brother accounts for 5/9 of the total amount of money of the two, and the younger brother accounts for 4/9 of the total amount of money of the two

Later, the younger brother's money: the elder brother's money = 2:3 Then, the elder brother accounts for 3/5 of the total amount of money of the two, and the younger brother accounts for 2/5 of the total amount of money of the two

3. The total amount of money for two people: 4 (3/5 9/5) = 4 2 45 = 90 (yuan).

4. The younger brother's original money: 90 (1 4 5) 4 = 40 (yuan).

5. Brother's original money: 90 (1 4 5) 5 = 50 (yuan) or 90 40 = 50 (yuan).

The elder brother has x yuan, and the younger brother has y yuan.

Two equations are obtained according to the meaning of the question.

4 5 x=y (1)2 3 (x+4)=y-4 (2) Bring Eq. (1) into Eq. (2).

2/15 x=20/3

Find x=50 y=40

That is, the brother has 50 yuan, and the younger brother has 40 yuan.

If only one unknown is given, that is, the brother has x, and the brother has 4 5 x according to the meaning of the question there are 2 3 (x+4)=4 5x -4 pass merge to get it.

2/15 x=20/3

Find x=50 y=40

That is, the brother has 50 yuan, and the younger brother has 40 yuan.

The elder brother has x yuan, and the younger brother has four-fifths x yuan.

From the title: 4/5 x-4 = 2/3 x

Then you can solve it......

It's normal to get a perfect score in math, but you always feel like you don't know anything.

Because you're just doing questions for the sake of doing them, just to get a perfect score on the test, but you don't explore the charm of these maths, and you don't understand some of the fun things about math, such as some formulas, for example, some stories between various celebrities.

And the fun part of mathematics is precisely that he deduces a lot of formulas, or does some new math problems by himself, summarizes the methods by himself, and then can use some of the places he is interested in.

Of course, you get a perfect score on the questions, which means that you are also working hard in mathematics, but you still feel that you don't know anything, which means that you are just trying to learn these problems, but you are not interested in other aspects of mathematics.

Therefore, I still hope that you will have more interest in mathematics, and then you will be able to learn more in-depth things, and then you will be able to know how these things are combined with our lives, so that you can understand more and more what you will know and what you should learn.

Question 3:

x+y)²-x+y)(x-y)

x²+2xy+y²-（x²-y²)

x²+2xy+y²-x²+y²

2xy+2y²

2（xy+y²）

xy+y²=15

2（xy+y²）=30

Question 1: x+2) +x-4)(x+4)=(2x-1)(x+4)x +4x+4+x -16=2x +7x-42x +4x-12-2x -7x+4=0

3x=8 gives x=-3 8

Question 2 is whether there is a problem with the question, I can't make the answer, if the question is really not right, I can make it, tell me after confirming the question, I will help you do it, if the question is like this, I can't help it.

a-b)(a+b)=a²-b²

a+b)（a+b)=a²+2ab+b²

a-b)(a-b)=a²-2ab+b²

Question 1 (a-b) (a+b) = a squared - b square (a + b) (a+b) = a square + 2ab + b square (a-b) (a-b) = a square - 2ab + b squared.

These formulas are to be memorized!!

So x-squared + 4x+4+x-squared-16=2xsquared+8x-x-4 x= -8 3

Question 2 m square + 1 (m squared) = [(1 m)-m] square + 2 = 3 (use the third formula).

Question 3 According to the formula mentioned above, (x+y) squared - (x+y)(x-y) = x square + 2xy + y squared - (x square - y squared) = 2 (xy + y squared) = 2*15 = 30

As long as you memorize the above three formulas, it is still very simple to use, so practice more.

Didn't understand what the title meant.

1) Connect the OD

oa=od∠oda=∠oad=∠ead

de⊥mn∠ade+∠ead=90°

ade+∠oda=∠ode=90°

de is the tangent line.

2)ad=3√5

If o does of ad over f, then f is the midpoint of ad.

af=3√5/2

oad=∠ead

rt△ead∽rt△dao

oa/af=ad/ae=√5

oa=3√5/2*√5=15/2

1)af=2t,be=t

feb∽△foa

bf/af=be/oa

2t-4)/2t=t/8

t=42)00t=2, f at point b, s=s(oeba)=202 in summary, s=t 2+16,0e(8-t,4), f(8,2t), a(8,0)ae 2=t 2+16

af^2=4t^2

ef^2=t^2+(2t-4)^2

If ae=af,t 2+16=4t 2 t=4 3 if ae=ef,t 2+16=t 2+(2t-4) 2 t=4 if af=ef,4t 2=t 2+(2t-4) 2 t=4(2-3).