Предмет: Алгебра, автор: shyngystolesh2008

(х + 2)(х – 2х + 4) – x(x + 2)(x – 2)​

Ответы

Автор ответа: airatairat28com
1

Ответ:

(x+2)*(x+4-x²)

Объяснение:

упрощённое: -x³- x²+6x+8

shyngystolesh2008: это правильно?
airatairat28com: yes
airatairat28com: нижний
shyngystolesh2008: что нижний
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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.

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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.

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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?
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