Предмет: Алгебра, автор: leilamaksot

а) (x+7)²=79+(x-4)(x+4)
b) 16y²-64=0

Приложения:

Ответы

Автор ответа: Sconkone

2

Ответ:

Объяснение:

а) (x+7)²=79+(x-4)(x+4)

x²+14x+49=79+x²-16

14x=79-16-49

14x=14

x=1

b) 16y²-64=0

(4y-8)(4y+8)=0

1.1) 4y-8=0

4y=8

y=2

1.2) 4y+8=0

4y=-8

y=-2

leilamaksot: спасибо

Sconkone: не за что))

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: Legomenchik

Запишите слова вставляя пропущенные буквы и правильно подбирая проверочные слова.

2 года назад

Предмет: Українська мова, автор: kolisinskaya71

Які з поданих слів ніколи не бувають вставними? Їх підкреслити.
Немовбито, може, навіть, по - перше, отже, звичайно, раптом, либонь, мовляв, напевне.

2 года назад

Предмет: Русский язык, автор: Bulvar38

Сколько здесь предложений Поднялась за рекой темная туча загромыхал гром пронесся по макушкам деревьев вихрь закачались деревья закружились над поляной листья упали первые капли дождя

2 года назад

Предмет: Математика, автор: egorkaProshkin

Решите плез срочно, на уроке дали, меня не было, а учителю пофиг

8 лет назад

Предмет: Английский язык, автор: 777Help

Помогите. Очень срочно

1. Обведите правильную форму глагола в скобках: Present Simple или Present Continuous Tenses. (10 б)

1. It is 12 o'clock. The family (has/ is having) tea.

2. In the morning my mother (cooks/ is cooking) breakfast for us.

3.1 (have/ am having) a car and I usually (drive/ am driving) to work.

4. Dick (leaves/ is leaving) home at half past eight in the morning. He (goes/ is going) to his office by bus.

5. In the evening we (watch/ are watching) TV.

6. Look at Mike. He (does/ is doing) his lessons.

7. The weather is fine. The sun (shines/ is shining) and it (doesn't rain/ isn't raining).

8. It often (rains/ is raining) in autumn.

9. Kitty (likes/ is liking) ice-cream.

10. My friend (lives/ is living) in London.

2. Вставьте do или does в пропуски. (10б)

1. …you sleep well? Yes, I ... .

2. …your sister wash the plates? Yes, she ... .

3. What ... your teacher read to you?

4. ... Mr. Snowdon speak Russian? No, he ... not.

5. Where ... you take books from?

6. Pamela ... not drive a car.

7. David ... not like getting up early.

8.How long ... it take you to get to school?

9.... she play tennis well ? No, she... not.

lO. What languages ... John speak?

3. Составьте предложения из данных слов. Помните о порядке слов.(10 б)

l. Not far/ we/ from/ the park/ live/._____________________________________________

2. Kate's/ is/ a doctor/ father/ good._____________________________________________

3. Now/ my/ is/ in/ playing/ sister/ the garden._____________________________________

4. When/ usually/ you/ get up/ do/?______________________________________________

5. Is/ all/ why/ crying/ the baby/ time?____________________________________________

6. He/ interesting/ give/ you/ a book/ can/._________________________________________

7. Uncle/ funny/ is/ man/ Albert/.________________________________________________

8. In/ have/ your/ pocket/ you/ what/ do/?_________________________________________

9. Talking/ what/ he/ about/ is/?________________________________________________

10. Has/ at/ she/ o'clock/ dinner/ usually/ two/._____________________________________

4.Найдите и исправьте ошибки.(10 б)

1. Не live in Oxford.

2. She sometimes eat in a restaurant.

3. Michael Riley is married not.

4. Rita have a new car.

5. On Fridays I to the cinema go.

6. She not like cooking very much.

7. Is he live in Liverpool?

8. What you have for breakfast?

9. Does she gets up early?

10. Why do the baby crying?

5. Употребите прилагательные в нужной форме. (10 б)

1. I think bicycles are (safe) than motorcycles. ___________________________________

2. Woolen gloves are (warm) than silk ones._____________________________________

3. Tom is (lazy) pupil in our class._____________________________________________

4. Flowers are (pretty) than vegetables. ________________________________________

5.1 think the Beatles' songs are (popular) songs._________________________________

6. Margaret is (nice) person I know.____________________________________________

7.1 think Chinese food is (delicious) than French._________________________________

8. In my opinion cats are (smart) than dogs.______________________________________

9. The elephant is (big) than tiger.______________________________________________

10. Sid is a talkative boy. He is ... than Bill._______________________________________

6. Поставьте глаголы, данные в скобках, в Past Simple Tense. (10 б)

l. Last week we (to be) at the library.___________________________________________

2. They (to play) games till evening.____________________________________________

З.Не (to give) me his pen._____________________________________________________

4. I (to meet) my friend on the way to school.______________________________________

5. Gagarin (to be) the first man in space._________________________________________

6. She (to live) in the country last summer.________________________________________

7. A. Christie (to write) 75 detective stories._______________________________________

8. He (to buy) bread and milk for breakfast._______________________________________

9. Father (to take) children to the park on Sunday. _________________________________

10. They (to be) in the Zoo last week.__

8 лет назад