Предмет: Математика, автор: H1miK2

определите взаимное расположение прямых 2x-5y-20=0 и 5x+2y-10=0

Ответы

Автор ответа: nafanya2014

прямые взаимно перпендикулярны, так как их нормальные векторы ортогональны.
Скалярное произведение нормальных векторов {2;-5} и {5;2} равно 0
2*5+(-5)*2=10-10=0

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Русский язык, автор: nik292445

Помогите пожалуйста))))

2 года назад

Предмет: Английский язык, автор: Katyantipina5557

ПОМОГИТЕ СДЕЛАТЬ ТЕСТ ПО АНГЛИЙСКОМУ,СКОЛЬКО СМОЖЕТЕ!!!
Task 2: Fill in "the" if necessary.
1. ___ Bermuda Triangle is located in ___ Atlantic Ocean.
2. ___ Lake Superior is the largest of ___ Great Lakes.
3. In ___ Atlantic Ocean, ___ American Mediterranean Sea is the combination of
the seas of ___ Gulf of Mexico and ___ Caribbean Sea.
4. The country I liked most of all was ___ Italy.
5. Next year I want to visit ____ South America and to ____ Buenos Aires in ____
Argentine.
6. ___ Island of Madeira is historically Portuguese territory.
7. ___ Borneo is situated in the waters of ___ South China Sea.
8. ___ Himalayas include more than a hundred mountains exceeding 7,200 metres.
9. ___ Europe is bordered towards the north by ____ Arctic Ocean, towards ___
south by ___ Mediterranean Sea and ___ Black Sea, towards ___ west by ___
Atlantic Ocean and ___ east by ___ Asia.
10. ___ Urals divide ___Asia and ___Europe.

Task 3: Use the verbs in the Past Simple or Present Perfect/Present Perfect
Continuous.
1. I (like) _______ him when I was at school.
2. He (live) _______ in New York since 2001.
3. I (not see) _______ Pete last night.
4. I (look for) _______ this book yesterday.
5. I (to watch) _____ this movie for about 2 hours.

Task 4: Use must/mustn’t, may, can/can’t, should/shouldn’t, need/needn’t.
1. Students ___ leave the classroom before the ring bells.
2. You ___ brush your teeth in the morning.
3. ___ you pass my pencil to me?
4. You've been driving all day. You ________ be exhausted!
5. You ________ smoke so much. It's bad for your health!
6. I know he speaks five languages, but ________ he speak Arabic?
7. I'm on my way. I ________ be there in about 10 minutes.
8. I ________ afford that.
9. This ________ be dangerous if you don't have the right equipment.
10. You ________ yell at your parents. It's not nice.

Task 5: Fill in the gaps with the reflexive pronouns.
1. Forget it! I’ll do it _____ .
2. She burnt _____ on the oven yesterday.
3. He talks to _____ all the time. It doesn’t mean he’s crazy.
4. We all enjoyed _____ very much on the picnic.
5. The protesters locked _____ in the church and refused to come out.
6. Your sister is very busy, so you’ll have to do this task by _____ .
Task 6: Circle the correct answer.

1. The UK is divided into four parts:
e) England, Scotland, New Zealand, Wales
f) England, Scotland, Ireland, Wales
g) England, Scotland, Northern Ireland, Wales
h) England, Scotland, Southern Ireland, Wales
2. The flag of the UK is called:
e) Union Jack
f) Union Dave
g) Union Jim
h) Crazy Jack
3. Choose the right capital of each part of the UK:
e) English capital 1) London
f) Scottish capital 2) Birmingham
g) Welsh capital 3) Edinburgh
h) Irish capital 4) Belfast
5) Cardiff
6) Manchester
4. Choose the right symbol for each part of the UK:
e) English symbol 1) thistle
f) Scottish symbol 2) leek
g) Welsh symbol 3) daffodil
h) Irish symbol 4) white rose
5) red rose
6) shamrock
5. The war for the throne between the Lancastrians and the Yorkists is known as:
e) the War of the shamrock and the thistle
f) the War of the red and white daffodil
g) the War of the leek and the rose
h) the War of the Red and White Rose
6. This war lasted for:
e) 60 years
f) 50 years
g) 130 years
h) 30 years
7. What is the capital of the USA:
e) New York
f) Las Vegas
g) Washington
h) Los Angeles
8. What is the name of the American flag:
e) Stars and Wars
f) Stripes and Ovals
g) Stars and Stripes
h) Stripes and Stones
9. How many states are there in the USA:
e) 53
f) 50
g) 52
h) 51
10. How many stripes are the on the American flag:
e) 13
f) 14
g) 15
h) 16

2 года назад

Предмет: Українська мова, автор: Аноним

Помогите СРОЧНО НАДО УКРАЇНСЬКА МОВА !!!!!!!

2 года назад

Предмет: Физика, автор: Lalka458

Автомобиль двигался по прямой траектории неравномерно. Первый участок пути 70 км он проехал за 30 минут, второй участок пути 30 км он проехал за 15 минут, третий участок пути 120 км он проехал за 40 минут. Найдите скорость на каждом участке пути и среднюю скорость движения автомобиля на всем протяжении пути тройте график зависимости скорости от времени.

8 лет назад

Предмет: Математика, автор: shestopal723

Допоможіть будь ласка:6(2в+7)+4(6в-2)=

8 лет назад