Предмет: Геометрия, автор: nata462728

АBCD-квадрат. О- точка перетину його діагоналей.Укажіть вектор,рівний вектору:1)АВ; 2)DA; 3)BO; 4)OA​

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Автор ответа: henkop
1

Відповідь:1) CD 2) CB 3) CO 4) OD

Пояснення: фотометричний парадокс Ольберса

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Предмет: Английский язык, автор: lololord
Present Perfect Simple VS Present Perfect Continuous

I. Поставь глаголы в скобках в нужную форму Present Perfect или Present Perfect Continuous

1. Don't walk in here. I …...........................(just/clean) the floor.

2. Jane is hungry. She …............(not /eat) anything for six hours.

3. She is tired. She …......(study) for four hours.

4. I don't want to see that film again. I ….......................(see) it twice already.

5. Sandy …...................(teach) English for 10 years.

6. Chris …..................(not/do) the washing up yet.

7. He …......................(walk) all the morning.

8. They.......................................(play) in the garden for two hours.

II. Поставь глаголы в скобках в нужную форму Present Perfect или Present Perfect Continuous

1.A: Where's Peter?

B: He …..................................................(just/leave) for work.

2.A: Why are you tired?

B: I...........................................................(play) football.

3.A: Is Paul studying in his room?

B: Yes, he …............................................(study) since 4:00.

4.A: How is Jim?

B:I don't know. I …...........................................(not/speak) to him since Monday.

5.A: Let's go out to eat tonight.

B: How about tomorrow night? I...................................(already/cook) dinner.

6.A: I am going to the cinema.

B: Again!You …...............................................(see) three films this week.

7.A: Have you finished the book that I lent you?

B: No, I ….......................................................(finish) it yet.

8.A: Has Diana lost weight?

B: Yes,she ….....................................................(exercise) for six months.

9.A: Does Tom work at MLT Limited?

B: Yes, he ….....................................................(work) at that company for ten years.

10.A: Do John and Andy live in Spain?

B: Yes, they...................................................(live)in Spain since 1997