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Anonymous users2024-02-06Summary. Which question.
There are no math teachers.
Which question. One or two questions.
Nope. Process or result.
Follow the answers to the exam.
Then you wait a minute.
How long will it take. Ask a custom message
All right. Is there still a topic?
No thanks, I'll give it a thumbs up.
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Anonymous users2024-02-05Summary. Hello dear, happy to answer for you: Hello!
The product of the vectors can be obtained by multiplying and adding the corresponding components. So, a*b = 3*-2) +4*1) =6 + 4 = length of vector a: the length of the vector can be solved by the Pythagorean theorem.
So, |a|=3 2 + 4 2) =9 + 16) =25 = length of vector b: Similarly, |b|=2) 2 + 1 2) =4 + 1) = cosine of the angle between vector a and vector b: we can use the dot product formula for vectors to calculate = a*b) a| *b|) 2 / 5 * 5)。
To sum up, according to the vectors a and b given in the problem, we get the following result:- The product of vector a and vector b is -2. - The length of vector a is 5.
The length of vector b is 5. - The cosine value of the angle between vector a and vector b is -cos (5 * 5).
Math teacher. 3. Known vectors a=(3,4),b=(-2,1), find a*b, a,b,cos
1.a*b: The product of the vectors can be obtained by multiplying and adding the corresponding components.
So, a*b = 3*-2) +4*1) =6 + 4 = length of vector a: the length of the vector can be solved by the Pythagorean jujube dry theorem. So, |a|=3 2 + 4 2) =9 + 16) =25 = length of vector b:
Again, defeat |b|=2) 2 + 1 2) =4 + 1) = cosine of the angle between vector a and vector b: we can use the dot product formula for the amount of the stool limb to calculate = a*b) a| *b|) 2 / 5 * 5)。To sum up, based on the vectors a and b given in the title, we get the following results:
The product of vector a and vector b is -2. - The length of vector a is 5. The length of vector b is 5.
- The cosine value of the angle between vector a and vector b is -cos (5 * 5).
Vectors have a wide range of applications in mathematics and physics. They can be used to describe the displacement, velocity, and acceleration of an object, among other things. The product of the vector can be used to calculate the work of the force cover base, the product of the matrix, etc.
The length and angle of vectors can be used to calculate trigonometric functions, determine the orthogonality of vectors, and so on. Vectors also play an important role in leading domains such as computer graphics and machine learning.
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Anonymous users2024-02-04Summary. Let the profit of type A be $ x and type B be $y.
Column equations.
5x+10y=2000
10x+5y=1600
x=80, y=160
Are you a math teacher?
Hello, is there a math problem, or do you want to consult something.
Is there something wrong with it, I see you've written it all.
Can you type? If you have the ability to do math, you can type it.
Didn't you write it all, and it was written very neatly.
24. Ask for an answer.
Two or three asked, wait for me for a while, I'll knock it down.
One. Let the profit of type A be x, and type B be the system of y-yuan equations, so that we get 5x+10y=200010x+5y=1600, and we get x=80, y=160
The second question, type A is a unit, then type B is 100-a unit and A 1 2 (100-a) gets a 100 3w = 80a + 160 (100-a) according to the inequality, when a = 34 units, the maximum profit is obtained.
Do you need a third question<>
If there is no problem, you can click to end the consultation and give me a thumbs up<><
I haven't received a <> of praise yet, if you still have questions, you can continue to ask me, if you have questions about other subjects, you can also ask me, I have a good grasp of junior high school science knowledge, and I can see through the questions you did, I feel that you should study well.
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Anonymous users2024-02-03Let's talk about the math teacher in junior high school.
The lectures are very good, the boards are neat, the people are very good, and they are humorous.
The cooling of winter will also remind us.
I will arrive very early in the morning (I am the head teacher).
In the summer, I would play with other teachers, and if we were in PE class, our classmates would have a chat next to them, watching them play, and the teachers also liked to play football, and they were all great, well, very handsome.
There are penalties for making mistakes, such as holding a shovel if you are caught chewing gum, or sticking gum to the floor in the hallway or classroom (which is funny to think about now).
If the mop is broken, the mop will be repaired with the labor councilor.
Every week, we will write a weekly diary, and the encouragement before the big exam will be written in it.
I remember the most impressive thing is that he gave us a copy of our homework book (a vertically turned one), put it on the windowsill, and the wind blew it off many times, but he just turned it in a different direction and didn't drop it (at that time, I thought it was so wise and magical).
And he said that I may not be able to do some questions, but I can speak; Extraordinary performance is to get the question of the meeting right.
Later, he was no longer my homeroom teacher, nor was he my math teacher, and I missed his class when I listened to other math teachers (I felt this way), and I saved the scene in the extracurricular class.
The most touching thing is that I am about to graduate from college now, and he still remembers me, I am a very ordinary person with no sense of existence, thank you for remembering me.
I don't know if you think your math teacher is good or bad when you ask this, but the teacher has a really big impact on students, a teacher will have many students in his life, but there is only one teacher for a student in one age, I don't know if I say that, you know, he may not remember you, he may be proud of you, but you will remember him.
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Anonymous users2024-02-02Mathematics is too difficult, I don't have a level of education, I can usually learn mathematics well, if I can't do mental arithmetic, it's useless to find a job after graduation, and the major I choose is not very useful, if I forget it.
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Anonymous users2024-02-01One is humorous and the other is old-fashioned and stern.
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Anonymous users2024-01-31He is a nice person, very serious in teaching, and responsible for students.
Hello Chinese teacher. Thank you, because of you, I can swim in the ocean of knowledge, stroll and count the details of life. >>>More
I was impressed by the fact that the math teachers were very patient in answering the questions of their classmates, because in the subject of mathematics, there are often problems that they do not know, if the teacher can patiently explain the questions, the students will be very moved, especially when they feel that the questions are simple and embarrassed to say, they should be encouraged to ask boldly or encourage communication with their classmates. Also, when you talk about the topic, you must find a way to let the students understand, think about the problem from their point of view, dear, give praise, and ask questions.
The most important thing in mathematics is the textbook, as long as you read the textbook thoroughly, you can improve a lot of points, don't think that the concepts in the textbook are very boring, don't think that the example problems in the textbook are very simple, when taking the exam, 80% of the questions are the example problems in the textbook to be sublimated, if you do a good job of the example problems, have the ability to draw inferences, fully understand the concept, you can use the concept to reason about the problem, then half the success, the rest is to do more exercises, the size of mathematics seems to be many, in fact, it is nothing more than a few, buy a few more reputable tutorial books, In addition, mathematics must pay attention to error correction, the wrong questions in the problems that have been done must be read again, serious and do it again, error correction is very important, and there is repetition, repeated good questions, don't think that it will be, to be able to draw inferences from one another, if you do these points, it should not be a big problem, remember, you must be serious.
Why don't you do this, try to be when he doesn't exist, after all, it's not a good habit, and our math teacher does the same, and if you get a few questions wrong, you say you don't have a brain, in fact, you just have to leave it alone, but if you're going to negotiate with him, then you're going to be in the open, don't be afraid, as you said, 20 percent of the class is scolded, and they must be just as much as you hate math, and you think, you're a savior, and you're going to save those who are scolded by the teacher, after all, you're going to face the college entrance examination right away, and these are the things that need to be solved right away, if the teacher is still like that after the negotiation Don't worry about him, study your own, no matter if the teacher scolds you or not, you must do well in the test, have a home run, surprise the teacher, and this is the time when you had the best time to fight back.
Students who do not follow discipline Teachers should properly deal with students who do not follow discipline in the following ways: >>>More