Предмет: Геометрия, автор: mrmilkalii

ПОМОГИТЕ СРОЧНО!
Дано вектори a(-2;3) i b(4;2).
Порівняйте модулі векторів
c = 2 a + b
d = 2 a - 0,5 b
ОБОВ'ЯЗКово обчислити кожен вектор і його модуль.​

Ответы

Автор ответа: Anna45874
1

Модуль вектора можна знайти за формулою:

|ã| = √(x² + y²)

де x і y - координати вектора.

Отже, модулі векторів c і d дорівнюють:

|c| = √((-2)² + 3²) + √(4² + 2²) = √25 + √20 = √45 = 3√5

|d| = √((-2)² + 3²) - 0,5√(4² + 2²) = √25 - 0,5√20 = √45 - √10 = 3√5 - √10

Оскільки √10 > 0, то 3√5 - √10 < 3√5.

Отже, модуль вектора c більший за модуль вектора d.

Відповідь: |c| > |d|

Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Алгебра, автор: vikyyyyyyyys99
записати у стандартному вигляді
1) 901,5
2)62,03
3)2400,9
4)700,5
5)0,25
6)0,0031
7)0,000004
8)0,080911​
10 месяцев назад
Предмет: Українська література, автор: AnnaSadchuka
Напишіть план до казки "Єва та білосніжна квітка лілії"можливо хтось вчиться по Олеся Калинич, Світлана Дячок можливо вже робили і вчителі перевірили даю 100б​
10 месяцев назад
Предмет: Английский язык, автор: zanattlepova
Chinese Food - What a Way to Cook! My interest in Chinese food started many years ago, when I had my first job. I was a young reporter for the Daily Journal in San Francisco. Our office wasn't far from China town. I usually managed to arrange my schedule so that I could go there at least two or three times a week for a good meal. The first time I ever ate Chinese food I loved it. And since then, it just tastes better and better tome. The first thing I loved I noticed was the fresh taste of the meat and vegetables. When I learned more about the food. I began to understand why it has this unique feature. About 5000 years ago, China lost much of its wood because of overpopulation and poor management of its forests. This loss was very bad for the country of course, but it turned out to be very good for the food. Wood became very expensive and hard to get, so the Chinese had to either find a substitute for their valuable, so people found ways to economize. In order to economize in cooking they had to use very little wood. So they started cutting their meat and vegetables into small pieces before they put them in the hot oil. That way, the food cooked faster and they saved their fuel. The food prepared in this manner kept its fresh flavor-and it's that flavor that attracts people to the art of Chinese cooking. I often wonder if the Chinese appreciated their solution to that ancient energy crisis as much as I do now-whenever I eat Chinese food. -Pete Maxwell. Staff Writer 1. Why was wood so valuable in ancient China? A) There are many woods B) The loss of the wood was hard for the country C) Wood became very expensive D) The wood was valuable E) China lost many woods 2.... why Chinese food has unique feature A) He learnt a lot of about food B) He learned about medical properties C) He thought it was comforting D) He managed to go to the restaurant E) He felt great 3. How did the Chinese prepare their food for cooking? A) Cutting their meat and vegetables into small pieces B) They didn't save their fuels C) They loved cooking D) To economize in cooking E) They use very little wood 4. The reason of losing much wood A) Because of bad weather conditions B) Because of over population C) Because of many floods D) Because of much fire E) Because of good management of its forest 5. The true statement A) I lived in Chine many years B) I noticed the food wasn't the fresh taste of the meat and vegetables C) I was a young doctor D) I didn't love eating Chinese food E) The office was near China town 6. Do the Chinese value their solution to the ancient energy crisis so much A) The ancient energy crisis very useful B) They love their Motherland C) They prefer being wise D) They don't know anything about valuation E) They appreciate their solution 7. An ancient Chinese cooking is ... A) Saving fire wood B) Using many vegetables C) cutting meat and vegetables D) Fast food preparation E) Keeping its fresh flavor 8. The Chinese are ... A) careless B) Happy C) fearless D) patient E) Patriotic 9. How did the Chinese energy problem help their cooking? A) To economize in cooking B) To use much wood C) To search the wood in another countries D) To have to use very little wood E) To cook faster 10. The text is about ... A) Chinese cooking B) The population C) The art Chinese cooking D) Chinese food E) Good meal of the Chines​
10 месяцев назад
Предмет: Математика, автор: ruslangajduk16
26x+13+4x
Упростите выражение используя арифмитические действия ​
6 лет назад
Предмет: Русский язык, автор: markotlivnoi
проспрягать слова:
сверкать
ненавидеть
дышать
строить
обидеть
плескаться
держать
терпеть​
6 лет назад