Предмет: Алгебра, автор: Dashaaa1598

среднее геометрическое четырех положительных чисел равно 20.три из этих чисел соответственно равны  8,10 и 25.найдите четвертое число

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Автор ответа: Rechnung
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1. The meeting …… begin at 5 o’clock. Don’t be late.

a) has to; b) is to; c) should; d) must.

2. It was raining hard and we …… wait until it stopped raining.

a) had to; b) were to; c) should; d) must.

3. May I go there right now? – Yes, you …… .

a) can; b) must; c) may; d) should.

4. I …… help you? – No, you …… , I’ll do everything myself.

a) can, can’t; c) need, needn’t;

b) must, mustn’t; d) should, shouldn’t.

5. The question …… be solved before we begin doing anything.

a) can; b) may; c) is to; d) must.

6. Children, have you been playing with my umbrella? It …… open!

a) can’t; b) shouldn’t; c) won’t; d) needn’t.

7. He was so weak that he …… lift his head.

a) can’t; b) couldn’t; c) isn’t able to; d) wouldn’t.

8. He is much better and …… walk without my help now.

a) may; b) must; c) has to; d) can.

9. Yesterday’s rain spoilt my hat completely. I …… buy a new one.

a) could; b) must; c) had to; d) ought to.

10. Children .. …… play with matches.

a) aren’t; b) mustn’t; c) shouldn’t; d) needn’t.

11. I knocked more than once but she ......... …… let me in.

a) couldn’t; b) shouldn’t; c) mustn’t; d) wouldn’t.

12. There .. …… be a discussion later on.

a) was to; b) had to; c) must; d) should.

13. Tomorrow I shall be free and ....... …… help you.

a) can; b) may; c) shall be able to; d) shall be allowed to.

14. It stopped raining, and mother told us that we ............ …… go out.

a) could; b) might; c) were able to; d) had to.