Предмет: Математика, автор: vipgera176

два комплексных числа z1=3i+4и z2=-4i-3 найти z1/z2

Ответы

Автор ответа: quickambulance

Умножаем числитель и знаменатель на сопряженое знаменателю число, потом знаменатель раскрываем как разность квадратов:
(3i+4)/(-4i-3) = (3i+4)(4i-3)/((-4i-3)(4i-3)) = - (3i+4)(4i-3)/((4i+3)(4i-3)) =
- (3i+4)(4i-3)/(-16-9) = (12i*i + 16i -9i - 12)/25 = (-12 + 7i -12)/25 = -24/25 + (7/25)i

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Литература, автор: ibashko2709

в чём измеряется богатство сильвио

6 лет назад

Предмет: Английский язык, автор: qwertq28sj

Срочно!!!!
Задание 1. Переведите письменно вопросительные предложения разных видов на русский язык.
(a) General Questions
1. Are you a student?
2. Has he invited you to his birthday party?
3. Do you play the piano?
4. Have you seen this man before?
5. Will you play the guitar to us?
6. Were you at college yesterday?
7. Did he read the new book?
8. Is she fond of reading science fiction?
9. Am I right?
10. Are they coming with us?

(b) Alternative Questions
1. Is he a good or a bad student?
2. Do they live in Moscow or in St. Petersburg?
3. Have you read this or that book?
4. Will you go to the disco or stay at home in the evening?
5. Are you reading or just dreaming?
6. Did they give him an album or roller skates as a present?
7. Was she working or playing a computer game when they came
8. Does he play tennis or football in his free time?
9. Would you like tea or coffee?
10. Has he been dreaming about a PC or a musical centre?

(c) Special Questions
1. Which is the largest room in your apartment?
2. Where are you going?
3. When does the lesson start?
4. Why were you staying at home yesterday?
5. What has happened at the end of the story?
6. How many people will be present at the party?
7. How old are you?
8. Whom did he invite?
9. Where did he live when he was a little boy?
10. What were they laughing at when I came in?
11. What kind of music are you fond of?
12. How much time did it take to write the test?

(d) Questions to the Subject
1. Who enjoys this music?
2. Who will come to the party?
3. Who was ready to answer?
4. Who knows the results?
5. Who spoke to Vlad yesterday?
6. Who has arrived early?
7. Who was playing the piano in the next room?
8. Who is working with my computer?
9. Who has been reading this book?
10. Who will give him a nice present?

(e) Tag questions
1. He is a great theatre lover, isn’t he?
2. They aren’t close friends, are they?
3. She plays the piano well, doesn’t she?
4. He wasn’t busy yesterday, was he?
5. I am a good football player, aren’t I?
6. He has read all the books in science fiction, hasn’t he?
7. We are taking nice pictures, aren’t we?
8. She wasn’t cooking when we arrived, was she?
9. They visited a few museums, didn’t they?
10. The journey wasn’t expensive, was it?

6 лет назад

Предмет: Другие предметы, автор: Аноним

13. Назови старейшую из крупных улиц Нью-Йорка, протянувшуюся на 21 км через Манхэттен и 3,2 км через Бронкс,
уходящую на север от города ещё на 29 км и заканчивающуюся севернее Слипи-Холлоу в округе Уэстчестер. Эта улица
ведёт свою историю от первого поселения Новый Амстердам и переводится на русский язык как "широкий путь". Является
сердцем американской театральной индустрии, на ней находится около 40 крупных коммерческих театров. Улица также
считается местом самых престижных вернисажей. Её называют предпринимательской улицей, поскольку на ней
расположено огромное количество офисных зданий и предприятий.
A) Brighton Beach Б) Broadway B) Time Square
Г) The 5th Avenue Д) Wall Street
Даю 35баллов Помогите пжпжпжпжпж

6 лет назад

Предмет: Физика, автор: эмилиятрюк

угол между падающим лучом и поверхностью зеркала равен 30 градуссов. найдите угол между падающим и отражающим лучами.

9 лет назад

Предмет: Алгебра, автор: Васильева1

Решить систему уравнений 2х-3у=5 3х+2у=14

9 лет назад