Дан квадрат ABCD. На сторонах BC и CD взяты точки M и N такие, что BM=1/4*AB и DN=3/5*AB. Найти - №23090404

Дан квадрат ABCD. На сторонах BC и CD взяты точки M и N такие, что BM=1/4*AB и DN=3/5*AB. Найти косинус угла MAN.
- Предмет:
  Математика
- Автор:
  giselaarmstrong
- 5 лет назад

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Revision of Tenses.

Task 1. Use Present Simple or Present Continuous giving the appropriate form of the verb in brackets:

1) Some people still think that the Sun (go) round the Earth.
2) On Sunday we (go) to see a new play in the theatre.
3) – What … Tom (do) now?
– He (play) tennis. He (play) tennis every weekend.
4) I (stay) with John for a few weeks until my flat is ready.
5) My friends always (stay) with Lucy when they go to Bristol.
6) We (leave) at 8 o’clock tomorrow.
7) The train to London (leave) at ten o’clock.
8) Alice (work) for an insurance company as an insurance agent.
9) Phil (work) in Japan at the moment.

Task 2. Use Past Simple or Present Perfect giving the appropriate form of the verb in brackets:

1) Who is she? I (never see) her before.
2) I (see) “Romeo and Juliette” when I was in London.
3) Laura (buy) a new dress last Monday, but she (not wear) it yet.
4) Robert (live) in Rome for the last three weeks. He (live) in Paris before he (go) to Italy.
5) – Didn’t it rain last July?
– Yes, it rained last July but it (not rain) this July.
6) Jane (work) in York since January. Last year she (work) in Manchester.
7) I’m sorry, I (not finish) yet.
8) My sister (finish) her lunch five minutes ago.
9) I (read) a book for an hour and then I (go) for a walk.

Task 3. Use Past Continuous where appropriate , if it is not suitable – use Past simple:

1) My parents (watch) television while I (write) some letters.
2) I (look) out of the window and (see) that we ((fly) over the mountains.
3) The students (talk) excitedly) when the teacher (come) in.
4) When I (walk) in they (talk) about the weather.
5) While Rossi (make) the tea Larry (clean) his car.
6) The pupils (sit) down, (take)out their pens and (start) writing.
7) As I (walk) down the road I (see) Michael.

Task 4. Use Present Perfect Simple or Continuous, or Past Simple or Continuous:

1) I (work) for the same company since I (leave) school.
2) Andy (wait) for Marry for more than an hour.
3) Sam (do) these exercises since 4 o’clock. He … already (do) five exercises.
4) I (clean) the car. Doesn’t it look nice?
5) It (snow) when I returned home. It (snow) all morning.
6) I am very tired. I (wash) clothes all day.
7) It (not rain) for a month now. The grass is very dry.
8) Ann (garden) all afternoon. She (plant) a lot of rose bushes.
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