High School Students Seeking Teaching!!! High School Mathematics !! Life saving !!!

Look at your question to know that you must be a boy, English is actually not difficult at all, there is a stupid method but it works, I did it in high school, I hope it applies to you. You teachers must write a lot of phrases or grammar in each chapter of the textbook, take good notes, and only write one sentence in your notebook about the sentences related to these phrases or grammar, and you can understand this question, if you don't understand it, no matter how many questions you do, it will be useless. You have several 10 minutes between classes, and each break is used to memorize these grammars, such as memorizing what you learned today during the morning break and memorizing what you learned before during the afternoon recess.

The words are also memorized in this way, so that English does not use much energy. Sleep while reciting English texts at night, at least recite each sentence silently, even if you can't memorize the whole text, it is easy to understand the sentence structure, and it is easy to understand the sentence structure if you understand grammar and phrases, and it is easy to understand it after memorizing grammar, which is interlocking, and learning English is not a waste of time and energy. The language is much the same, take good notes, read it several times a day, and it is very useful to read it for 5 minutes each time, good luck!

You've got good grades.

If you can score 110 points in English, it is not bad, but if you want to improve, you must take a multi-pronged approach, and words are the foundation.

Learning is mainly on your own, if you want to learn well in any subject, there is no shortcut, only continuous efforts and accumulation, I believe you can get good results.

You're good at logical thinking, but you don't get something out of language, and a lot of people do. Don't worry, calm down, the method is the most important, you can communicate with your English teacher Chinese teacher, let them help you analyze, after all, your teacher is more able to prescribe the right medicine than us, the method is flexible and diverse. Time, you go and make a plan and do things according to the plan.

Needless to say, high school is the most tiring and boring time, I hope you can persevere. Be relaxed and confident! You're only in your first year of high school now, so you'll have no problem working hard.

It is easy to find the right focus as (the lower end of the minor axis of the root number point, i.e., b = 1, c = root number 2, a 2 = 3, b 2 = 2, and the equation can be solved.

Let the right focus coordinate (c,0)d=|c+2√2|2=3, c=2 vertices are a(0,-1).

b=1a=√3

x^2/3+y^2=1

By the cosine theorem cosc=(a2+b 2-c 2) (2ab)=absin2c (2ab)=1 2*sin2c=sinc*cosc, thus sinc=1, c=90 degrees.

Since c is a right angle, AB (with an arrow on it) multiplied by AC (with an arrow on it) = C*B*Cosa=C*B*B C=9, so that B=3, and C-A=1, so A=4, C=5

Defining a domain is.

2sinx != 0=> sinx != 0 ->x != k*pi

Pi is pi.

cosa = 3/5

Immediately think of the right triangle on three sides are 3, 4, 5

So sina = 4 5

sin 2a = 2sina*cosa = 2 * 3/5 *4/5 = 24/25

cos 2a = (cosa)^2 - sina)^2 = 9/25 - 16/25 = - 7/25

So f(a) = (24 25 - 7 25)) 2 * 4 5 = 31 40

(1) 2sinx is not equal to 0

That is, x is not equal to k.

2) According to the title, sina = 4 5

i.e. sin2x=24 25

cos2x=-7/25

Therefore f(a) = 31 40

Regarding the efficient revision method, I was admitted to Peking University this year, I learn to read quickly, our school has a speed reading class, improve your academic performance by learning fast reading, with my personal experience, tell you a learning software that helps us improve our academic performance and learning efficiency, I hope it will be useful to you.

1. The method of efficient reading needs to be trained, which is a high-efficiency learning method of eye-brain coordination, under normal circumstances, the reader is trained to directly convert the words and symbols perceived by the visual organ into meaning, eliminate the potential sound phenomenon in the mind, form an eye-brain direct reflection, combined with memory training, to improve learning efficiency.

2. Since we usually have little contact with fast reading, we can train the coordination ability of the brain and eyes through direct training, last year, some scholars recommended the elite speed reading memory training as a holiday student learning plan, thinking that the software practice for 30 hours can increase the reading speed by about 5-10 times, learning to practice 1-2 hours a day, two weeks can achieve good results, ordinary people 300 words per minute reading speed will reach 3000 words per minute reading speed, Memory also improves rapidly. This suggestion has been the former director of the Psychological Research Office of the ** Institute of Education, Zhu Faliang, an expert who has been engaged in brain psychology research for many years, and is currently studying many classes to carry out holiday speed reading shorthand training courses, using the elite special speed reading memory training system.

3. Our class has been learning elite speed reading until now, I trained to the top, I was admitted to Peking University this year, and passed the interview of the Hong Kong University of Science and Technology, if you need it, I can give you my results. Speed reading as a lifelong learning skill is necessary to apply to school and student holiday learning, and I hope my experience will be useful to you.

English is useless if you don't memorize words, if you are not in a hurry, you can memorize 5 words a day and review them once a week. If you're in a hurry, memorize the key words! The main purpose of Chinese is to read more articles, understand the method of problem solving, and review the topic of the composition, relying on the usual accumulation, you can read a little article before going to bed.

Concentration and good study habits are the most basic ways to save study time and improve learning efficiency.

1.The habit of pre-studying. Preview can enable you to connect with previous knowledge, discover new problems, think about how to solve them, and bring problems that you can't understand to the class to better listen to the teacher's explanation.

2.The habit of taking notes and organizing them afterwards. As the content of the course grows and becomes more complex, taking notes can help to get to the point.

If the things you memorize in class are scattered due to time constraints, then you should organize them after class to make them comprehensive and organized. The process of sorting out is a very effective process, and it can also exercise your ability to analyze and summarize, so you should develop the habit of organizing your notes.

3.Review after class. To consolidate what you have learned, you must review it in a timely manner, reinforce it, and form a habit.

4.The habit of solving problems independently. If you have difficulty learning, you should try to "give it a try" by yourself first. Finish it on your own, taste the sweetness of victory, increase confidence in yourself, and bravely meet the challenge of the next problem.

5.The habit of careful observation and reflection. Each discipline requires itself to be observant. It is also necessary to develop the habit of thinking while observing, and to be diligent in thinking while being diligent in observing. Find the problem yourself, ask the problem, and solve the problem.

6.Actively read and write habits. Reading is the main channel for acquiring knowledge, and on the basis of repeated reading of textbooks, we should widely absorb extracurricular knowledge and information, and develop the habit of active reading.

Reading and writing are both rigorous training of cognitive skills such as observation, thinking and imagination, and they are mutually reinforcing. The writing process is still a training in the use of language and writing skills, so it is necessary to develop the habit of writing diligently.

7.Develop the habit of active learning. Habits don't happen overnight.

In short, it is a process of accumulation, the more you know, the better you learn, so memorize more and choose your own learning method. Good luck with your studies!