вычислите массовую долю натрия в натрий оксиде

О своих марках Иван сказал так: "У меня 18 марок и еще половина всех моих марок" Сколько марок у Ивана

Напишите нужный глагол в правильной форме 

A: Hi Liz. You look exhausted. 1) ...Have you been working... (you/work) overtime again?
B: Yes. I have. I 2) ..............................(help) my boss to update the tiles in the office all week. He 3) .............................. (read) the files and I 4) ........................... (write) down names, addresses, phone numbers and so on. What about you?
A: Well, I 5) ................................ (train) hard for the championship next week.
B: I see! 6) ................................ (you/lift) weights all day long?
A: Yes. for two weeks. How's Sue? 7) ................................. (she/study) for her exams?
B: No. she hasn't. She 8) .................................. (go) out every evening. I won't be surprised if she fails again!

1. A: Amanda ..have opened... (open) a shop which sells newspapers and magazines.
    B: Really? Where is it?
2. A: Where's Dan?
    B: He ............................... (just/go) to the post office. He'll be back soon.
3. A: Dave ................................ (learn) to drive for six months.
    B: I know. He hasn't passed his test yet. though.
4. A: I    ............................(know) Alison for ten years.
    B: Well. I only met her last week.
5. A: My uncle is painting his house again.
    B: Again? He ................................... (paint) it three times this year already.
6. A: Is Paul sleeping?
    B: Yes. he ................................. (sleep) since 10 o'clock last night.

A) ... I'm planning to buy a new house. I 1) ...We have been looking... (look) for one for two months now. So far I 2)......................... (look) at ten houses, but I 3) .................... (not/find) one I like.

B) My Spanish lessons are going very well. I 1) ........................... (learn) Spanish for five months now and I love it. 12) .................................... (already/learn) a lot.
C) ... John 1) ............................... (be) very busy recently. He 2) ..................... (paint) the living-room and the bedrooms, but he 3)........................... (not/ start) painting the kitchen yet.

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Торжественный въезд в Рим полководца-победителя

2√x-1 + корень 4-ой степени из√x-1 =3