Решить примеры.

3         1

-    +     -  = 

8          6

 

3,4*2,35=

 

-6+4=

 

(-9):(-3)=

 

3,2-0,15=

 

2

-     *   0,3=

3

 

2,75-3=  

          - 

          5

найдите значение выражения 25(1 - cos ^ a) ,если sina =2/5

Внутри прямого угла АОВ проведён луч ОС .Найдите градусы полученых углов 

а)Разность градусных мер угла СОВ и АОС равна 26 градусов 

б)АОС в 8 раз меньше угла СОВ.

Ex. 565. Use either the Infinitive or Gerund of the verbs in brackets. 1.1 have always tried (do) my best. 2. — My bolognese sauce always seems tasteless. — Have you ever tried (add) a little sugar to it? 3. Where did you get that money from? I don't remember (give) it to you. 4. Did you remember (post) that letter I gave you? 5. Passengers are forbidden (talk) to the driver. 6. I'd love (meet) you when I am next in Athens. 7. There is a regulation which forbids (smoke) in hospitals. 8. Wouldn't you prefer (stay) in this evening? 9.1 shall never forget (meet) you in Florence when you were with Alan. 10. Don't forget (give) me a ring as soon as you get back. 11. I cannot help (wonder) why she never goes out anywhere. 12. There was a lot to do. Fortunately, Janet agreed to help (prepare) the food. 13.1 don't want to go if it means (change) trains 14. I'm sorry, I didn't mean (interrupt) you. 15. , Won't you stay? There's a good match on TV. — no, thanks. I hate (watch) football. 16. Whenever John comes round, I like (cook) something special for him 17. — What do you like best about wintertime? — Well, if it has snowed during the night, I like (get up) early and (go) for a walk in the fresh snow. 18. — Do уоu really like (meet) people? — Not really. I'm rather a shy person.