Предмет: Алгебра, автор: guglru590

даю 35 баллов. Вычислите : ​

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Ответы

Автор ответа: Universalka
1

1)\frac{P_{9}-P_{7}}{P_{6}}=\frac{9!-7!}{6!}=\frac{7!*(8*9-1)}{6!}=\frac{6!*7*71}{6!}=7*71=\boxed{497} \\\\\\2)A_{5}^{4}-C_{5}^{3} =\frac{5!}{(5-4)!}-\frac{5!}{3!*(5-3)!}=5!-\frac{3!*4*5}{3!*2!}=5!-\frac{4*5}{1*2}=\\\\=1*2*3*4*5-  10=120-10=\boxed{110}

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D. Fill in the following sentences

behind, off (2), of, with, into, for, forward to, up, out of, back, across, out, away, out with, after

1. If a burglar breaks in, don't put a fight and never run __________ him.

2. He gave __________ smoking last year.

3. My alarm clock went __________ at 7 o'clock.

4. They came __________ this antique book at the market yesterday.

5. He had to stay in hospital for several weeks, so he fell __________ with his lesson.

6. Our teacher was very proud __________ her students.

7. We ran __________ bread, so we went to buy some.

8. She is looking __________ her holidays. She is going to spend this summer in Italy.

9. He can't cope __________ his problems alone. I suppose he needs psychologist's help and support of his relatives.

10. The new hit of Rolling Stones is coming __________ next week.

11.Suddenly I ran __________ my old friend in the street.

12. It's hot! Take __________ your jumper.

13. She is looking __________ a well-paid job in the city, as there is a high level of unemployment in the country.

14. She has fallen __________ Max because he lied to her.

15. Can you give me __________ my book, please?

16. A burger and fries to take __________ , please.







E. Choose the correct response

1. Do you fancy coming with me?

a. No, I haven't b. Thanks, but I'm afraid I can't

2. Two tickets for King Kong at 6 pm, please.

a. I'm afraid it's sold out b. Here is your change

3.Try it on and see if it fits.

a. OK! Hang on a second b. Really? Thank you very much.

4. I hate reality shows. Can't we watch the news?

a. I suppose so. b. Sure, I really like documentaries

5. Can you help me send an e-mail?

a. No problem. First of all turn on your computer. b. Access your e-mail account.

6. Would you like to go on a picnic?

a. That sounds great! b. What's that all about?

7. Can you send me an e-mail with the details?

a. That's fine! b. Certainly.

8. I find sitting exams the most stressful.

a. Don't mention! b. I don't agree!
Предмет: Математика, автор: Alex27111