1. Определите классы соединений, дайте названия веществ, формулы которых:
А. С2Н5СОН Б. НСООН В. С2Н5СООСН3 Г. СН3ОН

№1. На какое наибольшее число можно сократить дробь 270/630?

1) на 45; 2) на 60; 3) на 90; 4) другой ответ(уточните,какой именно).

№ 2. Какие числа следует поставить вместо букв a, b и с, чтобы все равенства стали верными: 56/8=14/a, 56/8=b/4, 56/8=112/с?

1) 2, 28 и 16; 2) 2, 23 и 4; 3) 2, 7 и 28; 4) другой ответ(уточните, какой именно). Заранее спасибо!

Напишите предложения, используя used to.
1. I (smoke), but I (give it up) last year.
2. I (not like) him. but then I (change) my mind.
3. He (live) in London before he (go) abroad.
4. I (earn) a lot of money, but then I flose) my job.
5. Гт surprised that they (join) the tennis dub. They (not like) tennis.
6. (y&u travel) a lot before you (get) this job?
7. I (work) in a factory before I (become) a teacher.
8. She (drive) a lot before she (have) the accident.
9. That old radio (work) before I (drop) it.
10. We (see) diem every week, but then we (have) an argument.
11. I (work) in a restaurant before I (go) to college.
12. She (play) a lot of tennis before she (break) her leg.
13. We (have) a garden, but then we (move) to a different house.
14. She Give) in Wales, but then she (move) back to Scodand.
15.1 (drive) a lorry before I (start) this business.

Преобразуйте многочлен выражение:(n-4)(u+1)+(u^2-u+1)(u+1)