1.Запишите формулы: оксидов серы 4 и 6, марганца 2, 4 и 7, хрома 2, 3 и 6Ю олова 2 и 4?

2.Назовите оксиды формулы которых: ZnO? Ag2O, Li2O, Cl2O, Cl2O,ClO2, As2O3?

 

Найти координаты вершини параболы у=(х - 3)^2

Учитель сказал написать ответ на этот вопрос:

Чем занималась казаки и их семьи в романе Тихий Дон?

Я, честно говоря, не понял про какую именно семью идет речь...

Пожалуйста помогите с заданием,и если можно перевод!Зарание спасибо!!! Задание!Choose the right form of the verb to make the sentences complete. A.1.Such long bridges seldom(are built/are being built).2.Excuseb the mess .The house(is painted/is being painted).3.I can`t give eou the articles now.They (are translated/are being translated).4.Room 47 is not ready yet.It (is cleaned/is being cleand).5.At the moment a new road (is built/is being built) round the city.6.Such books (are not translated/are not being translated)easily.7.We are expecting guests.Tables(are land/are being laid).8.Your room will be ready soon.The beds (are made/are being made). B.1.John said they couldn`t take photos.The camera (was repaired/was being repaired).2.When they arrived home the walls of the dining room (were painted/were being painted).3.We couldn`t get inside.the floors (were washed/were being washed).4.Computer games (were not played/were not being playrd)when I was your age.5.Last summer this edition of the novel(was not sold/was not being sold).6.When Mr Brown phoned,the article still (was translated/was being translayed).7.When I live in Germany,newspapers (were brought/were being brought)to us early in the morning.8.I entered the hotel at.8.Everybody was busy.Rooms (were prepared/were being prepared) for the arriving guests.