решите ; Cu SO4+HCl ----> Hg+H2SO4(концен)---> Cu +HCl----> NaNO3+HCl---->

острый угол прямоугольной трапеции равен 30 градусов.Сумма длин ее боковых сторон равна 36 см.Найдите высоту и площадь трапеции, если меньшее ее основание равно 8 корень 3см

Past Perfect/Past Perfect Continuous Ex.6. Open the brackets and complete the sentences with Past Perfect Simple or Past Perfect Continuous.

1. Her name was Logan. She _______________(be) a widow for fifteen years and had no children.

2. He wanted to find out how long the two men ________________(stay) with them.

3. We talked about what we _________________(do) since we left school.

4. The last member of the party was Neville, the film star, whom David _______________(know) for some time.

5. Basil said that he ___________________(write) all day and ______________(not eat) anything.

6. She said she _____________________(not see) him since he was in his first year at the university.

7. It was cold and dark in the small room because it __________________(rain) for five days.

8. He said he ________________(have) the statuette for a long time. The noise woke Joe who _________________(sleep) in his pram by the garage door.

На школьной выставке 72 рисунка. Выполнены акврелью 5/6 всех рисунков, а  0,25 остальных-карандашами. Сколько карандашных рисунков на выставке?

На поляне паслись ослы. К ним подошли несколько ребят.Если мальчики сядут по два на осла,то один мальчик останется без осла.Если мальчики сядут по три на осла,то один осёл останется без мальчика.Сколько ослов и сколько мальчиков было?