1кг печенья стоит 34грн. по формуле Р=34m вычислить стоимость  m кг. печенья ,если              m=4кг       m=5кг   m=10 кг

Упр. 214. Раскройте скобки, употребляя гла­голы в Past Simple, Past Continuous и Past Perfect.

I. By eight o'clock yesterday I (to do) my home­work and at eight I (to play) the piano. 2. By six o'clock father (to come) home and at six he (to have) dinner. 3. By nine o'clock yesterday grand­mother (to wash) the dishes and at nine she (to watch) TV. 4. When I (to meet) Tom, he (to eat) an ice-cream which he (to buy) at the corner of the street. 5. When I (tq come) home, my sister (to read) a book which she (to bring) from the library.

6. When mother (to come) home, the children (to eat) the soup which she (to cook) in the morning.

7. When I (to ring) up Mike, he still (to learn) the poem which he (to begin) learning at school.

8. When I (to look) out of the window, the chil­dren (to play) with a ball which Pete (to bring) from home. 9. By ten o'clock the children (to set­tle) comfortably on the sofa and at ten they (to watch) a TV film. 10. When father (to come) home, we (to cook) the mushrooms which we (to gather) in the wood. 11. When I (to see) Ann, she (to sort) the flowers which she (to pick) in the field. 12. When I (to come) home yesterday, I (to see) that my little brother (to break) my pen and (to play) with its pieces. 13. When I (to open) the door of the classroom, I (to see) that the teacher already (to come) and the pupils (to write) a dictation.

АВСD правильный тэтраэдр, точка К-середина  ребра СВ. Доказать, что треугольники AKC и DKB равны.. 

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