прогрессия. Помогите пожалуйста ( с решением ) , буду благодарна Сколько последовательных

прогрессия. Помогите пожалуйста ( с решением ) , буду благодарна

Сколько последовательных натуральных чисел, начиная с единицы, надо сложить, чтобы сумма превзошла 210?

5. Найдите сумму первых шести членов геометрической прогрессии, если ее десятый член равен 64, а знаменатель равен 1/2.
- Предмет:
  Алгебра
- Автор:
  sanaaglass
- 5 лет назад

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Раскройте скобки, чтобы получить Present Perfect или Past Simple.

I … (do) this exercise before.
I … (do) this exercise tw0 minutes ago.
We … (go) to school since the first form. .
We … (go) to school yesterday.
You … ( see) a horse last week.
You … (never/ see) a horse.
He … (just/say) that.
He … (say) that a minute ago.
They … (already/ have) breakfast.
They … ( have) breakfast at 2 o’clock.
* * *

Упражнение 2 (для начинающих). Раскройте скобки, чтобы получить Present Perfect или Past Simple в отрицательной форме.

I … (not/ do) this exercise before.
I … (not/ do) this exercise yesterday.
We … (not/ go) to school since the first form. .
We … (not/ go) to school yesterday.
You … ( not/ see) a horse last week.
You … (never/ see) a horse.
He … (not /say) that yet.
He … (say) that a minute ago.
They … (not/ have) breakfast yet.
They …( not/have) breakfast an hour ago.
* * *

Упражнение 3 (для начинающих). Раскройте скобки, чтобы получить Present Perfect или Past Simple в вопросительной форме.

… you … (hear) this song before?
… you … (hear) this song yesterday?
… they … (go) to school since the first form?
… they … (go) to school yesterday?
… he … ( ride) a horse last week?
… he … (never/ ride) a balloon?
… she … (just/say) that?
… she … (say) that a minute ago?
… you … (draw) a picture at the last lesson?
… you … (never/ draw) a picture before?
… they…. (already/ have) breakfast?
… they … ( have) breakfast an hour ago?
* * *

Упражнение 4. Перепишите предложения, используя Present Perfect or the Past Simple.
ПРИМЕР. I am writing a letter to my cousin, (already, yesterday).

I have already written a letter to my cousin.
I wrote a letter to my cousin yesterday.
1. Mother is bringing our tea. (a few minutes ago; not yet)
2. The bell is ringing. (just; some minutes ago)
3. He is going to London in a few days. (already; last week)
4. The boys are playing football in the yard now. (yesterday; many times)
5. Anna is reading a new novel by Chekhov. (this month; last year)
6. Students are cleaning their classrooms. (already; last Saturday)
7. The teacher is explaining a new rule. (just, at the last lesson)
8. Ann is doing the flat. (just; on Friday)
9. They are discussing this plan again. (many times; a few days ago)
10. Granny is making a birthday cake. (just; yesterday)
11. The birds are flying to the South. (already; at the end of August)
12. The train is coming. (just; an hour ago)
13. Who is your friend speaking to? (yesterday, just)
14. We are writing the words from the text. (already, at the last lesson)

* * *

Упражнение 5. Перепишите предложения, используя Present Perfect or the Past Simple.

1. This scientist … (write) a lot of books. He … (write) his first one in 2001.
2. … you … (ever see) a film as good as that?
3. I … (never travel) to the USA. What about you? When … (you go) there?
4. He … (live) in Manchester for eight years, and he wants to move to another place.
5. She … (live) in Manchester for two years, and then in 2003 she … (move) to London.
6. We … (meet) Jane and Alan two years ago. How long … (you know) them?

* * *

Упражнение 6. Найдите предложения с ошибками и исправьте их.

Do you know about Sue? She has given up her job.
My mother has grown up in Scotland.
How many plays has Shakespeare written?
Oh, I’ve cut my finger. It’s bleeding.
The Chinese have invented paper.
Where have you been born?
Mary isn’t at home. She has gone shopping.
- Предмет:
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- Автор:
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- 5 лет назад
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