Напишите формулы оксидов, которым соответствуют следующие кислоты: а) HMnO4; б) H2CO3; в) H2SO4; г) H2SO3; д) H3BO3; е) HPO3; ж) H3PO4.

 

1) на графике функции Y=X^2 найдите точку абсцисса и ордината которой- противоположные числа

2)  на графике функции Y=X^2 найдите точку абсцисса которой равна ординате.

РЕШИТЕ ПОЖАЛУЙСТАА!!

Упражнение 237

Раскроите скобки, употребляя глаголы в Past Simple, Past Continuous u Past Perfect.

1. There (to be) two men in the room. One of them (to write) something while the other (to read) a news-paper. 2. He (not to tell) me that he (to receive) a telegram from her. 3. I (to ask) him if he (to know) where she (to live). I (to say) I (not to know) her ad­dress. 4. He (to ask) me if I (can) give him your ad­dress. 5. She (to say) that he (to give) her the wrong address. 6. I (to ask) him where he (to put) my let­ter. 7. He (to tell) us that they (to spend) all the money. 8. I (to sit) in an armchair and (to think) of my coming trip across the North Sea when the door suddenly (to open) and an old friend of mine whom I (not to see) for a very long time (to enter) the room. 9. She (to come) to see us just at the time when we (to have) dinner. It (to be) the first time I (to see) her. 10. I (to see) him just as he (to leave) the hotel. 11. I (not to see) him before we (to meet) at the con­cert. 12. He (to leave) the house before I (to have) time to ask him anything. 13. After spending sever­al days in Paris he (to feel) lonely and (to want) to return home. 14.1 (to think) he already (to go) home. 15.1 (to find) the old man in the garden. He (to talk) to some children who (to stand) around listening to him. 16. He (to speak) a language we never (to hear) before. 17. He (to tell) me he (to learn) it from the newspaper. 18. He (to enter) the room, (to take) something from the desk and (to go) out.

Составьте предложение с даннымии словосочетаниями.

1) любитель поесть, решили поесть, зашли поесть, приказал поесть;

2) Мечта учиться, начал учиться, уехал учиться, попросил учиться;

3) Умение плавать, хотел плавать, отправился плавать, советовал плавать.