Вопрос по геометрии:

Как найти все стороны треугольника, если известны только периметр и одна сторона, и их разность?

Вопрос по физике:

В электрической цепи ток и напряжение меняются по законам I = 50 cos l00(пt) (A), U = 30 cos(100 пt + п/3) (В). Найдите мощность выделяемую в цепи. Там формула P=IU\2. Как пойти к этой формуле?Можно пожалуйста с подробным объяснением)

Вопрос по английскому языку:

Change the following affirmative sentences into

negative ones. (Give different versions where possible.)

1. Some of the students have already passed the exam.

2. It

was so unexpected and unusual.

3. There was some hesitation in her eyes.

4. But he did tell the truth after all.

5. The situation will

change for the better.

6. I was puzzled by many things.

7. It was

to happen some day.

8. There are lots of things to add.

9. The article will lose its significance by that time.

10. I will tell you

everything some day.

Вопрос по русскому языку:

Вопрос по английскому языку:

Make up questions of various kinds to suit the

following answers.

1. It is hard to say.

2. Who knows?

3. Not him.

4. Sure he will.

5. Well, it depends.

6. Not in the least.

7. By all means.

8. Why not?

9. What nonsense!

10. I think I do.

11. Of course not.

12. Who else could it be!

13. None.

14. No doubt they are.

15. Not yet.

16. Neither of them.

17. More or less.

18. Why should he?