выразите в м куб. - 6578 см куб.

напишите 6 предложений с частицами

Поставьте глагол в нужную форму.

1. You (to hear) anything?

I (to listen) hart, but i not (to hear) anything.

2. My brother (to smoke) a great deal.

3. Listen! the telephone (to ring).

4. It here is Peter? He (to have) his English lesson now.

5. I think that he always (to have) it at this hour.

6. Helen (to learn) English at the institute.

7. They (to discuss) an important qaestions.

8. My brother (to be) in the hospital.

назовите исследователей- географов, внесших важный вклад в изучение природы Африки. вкратце расскажите о них.

Сократите дробь:

4x + 20/x^2 + 10x + 25