как звали правителя московского княжества

к карбонату кальция, массой 50 г добавили раствор содержащий азотную кислоту массой 126 г, найти объём выделившегося газа. нормальные условия.

Найдите значение выражения (6,2a-3)+(4-7,2a) при a=-2,5 Варианты: 1)1,5 2)-3,5 3)3,5 4)-1,5

 How did the children ask and answer the questions? Tick the correct question or answer.

1. Did you have a nice weekend ?

a. Yes, I have. I`ve been to the theatre.

b. Yes, I do. I like it a lot.

c. Yes, I did. And what about you?

2.

a. What did you do yesterday?

b. Why not go to the museum tomorrow?

c.What were you doing there?

I went to the Museum of London.

3.

a. Have you been to Hyde Park?

b. Did you ikke Hyde Park?

c. Why not go to the park?

I`d like to.

4.

a. Do you often go to the sports centre?

b. Why can`t you go there?

c. Let`s go to the cinema.

Sorry, I can`t. I have to do my homework.

5.

a. Have you ever been to the capital of your country?

b. Did you go to the capital of your country?

c. Were you in the capital of your country?

Yes, I have. I`ve been there twice.

6. Have you ever beer to London?

a. Yes, I was.

b. No, I haven`t.

c. Yes, I`did.