Решите уравнение 5у2 - 2у=0

Переведите предложения, подчеркните в каждом из них модальный глагол и его эквивалент:

1. Artificial light can be produced in several ways.

2. Objects may reflect most of one colour, half of another colour, and a small percentage of some others.

3. You must read this book. It’s really excellent.

4. English school children have to learn a complicated system of weights and measures.

5. You are to stay at the laboratory till the professor comes. That is his request.

6. You have put too much in your rucksack you will never be able to carry all that.

как получить 12 из четырех 9

в прямоугольном треугольнике abc гипотенуза равна 13 катет ac равен 12 найти тангенс угла a