Ответ по предмету Химия: Скласти формули таких сполук за валентністю, срочноо

Предмет: Математика, автор: albinafedorcenko84

Якій четверті належить кут 4П/3
В якій четверті сosa < 0 і tga >0?
В якій четверті sina>0 і tga>0?
Якій четверті належить кут 135
В яких четвертях косинус приймає додатніх значень?
В якій четверті sina < 0 і tga < 0?
В яких четвертях синус приймає від'ємних значень?
СРОЧНО! ПОМОГИТЕЕЕ!

2 года назад

Предмет: Английский язык, автор: mirsaidnigmatov2009g

Упражнение 3. Fill in last night, ever, ago, just, yet, always in the right place.

1. Nick’s uncle went to Russia 3 years.

2. Mr. Rambler has come back from Belarus.

3. Nick has wanted to visit Belarus.

4. Mr. Rambler saw Yan.

5. They haven’t visited this old castle.

6. Have you been to England?

Упражнение 4. Choose the correct option.

She has /‘s had a moped since she was 15.
We took /‘ve taken a taxi to town that morning.
We played /'ve played volleyball last night
I'm really hungry. I didn’t eat / haven’t eaten since last night.
They visited/ ‘ve visited Colorado last summer.

Упражнение 5. Put the verbs in brackets in the Past Simple or in the Present Perfect.

1. Maria (get) ______ some bad news last week. She (be) ______ sad since she (get) ______ the bad news.

2. I (start) ______ school when I was five years old. I (be) ______ at school since I (be) ______ five years old.

3. I (change) ______ my job three times this year.

4. I (change) ______ my job three times last year.

5. The weather was hot and dry for many weeks. But two days ago it (rain) ______.

6. Tom (break) ______ his leg five days ago. He’s in hospital. He (be) ______ in hospital since he (break) ______ his leg.

7. Are you going to finish your work before you go to bed? — I (finish) ______ it (already). I (finish) ______ my work two hours ago.

Упражнение 6. Put the verbs in brackets in the Past Simple or in the Present Perfect.

1. I (have, just) ______ a nice pot of coffee. Would you like a cup?

2. I (see, not) ______ Steve this morning yet.

3. Carol and I are old friends. I (know) ______ her since I (be) ______ a freshman in high school.

4. Maria (have) ______ a lot of problems since she (come) ______ to this country.

5. I (go) ______ to Paris in 2003 and 2006.

6. A car came round the corner and I (jump) ______ out of the way.

7. Don’t throw the paper away because I (not to read) ______ it yet.

8. Is Jim going to eat lunch with us today? — No. He (eat) ______ (already).He (eat) ______ lunch an hour ago.

9. Since we (start) ______ doing this exercise, we (complete) ______ some sentences.

10. I (be) ______ never to Italy.

Упражнение 7. Put the verbs in brackets in the Past Simple or in the Present Perfect.

1. You (ever work) ______ in a shop?

2. I (work) ______ at my uncle’s shop when I was younger.

3. It’s the first time I (be) ______ on a ship.

4. Ann is looking for her key. She can’t find it. She (lose) ______ her key.

5. How many symphonies Beethoven (compose) ______?

6. Look! Somebody (spill) ______ ink on the notebook.

7. You (have) ______ a holiday this year yet?

8. You (see) ______ any good films recently?

9. He (have, not) ______ any problems since he (come ) ______ here.

Упражнение 8. Раскройте скобки, употребляя глаголы в Past Simple или Present Perfect

1. I (cut) ______ some flowers from my garden yesterday. I (cut) ______ lots of flowers from my garden so far this summer.

2. I (not / see) ______ Tom lately.

3. The artist (draw) ______ a picture of sunset yesterday. She (draw) ______ many pictures of sunsets in her lifetime.

4. I (feed) ______ birds at the park yesterday. I (feed) ______ birds at the park every day since I (lose) ______ my job.

5. Ann (wake up) ______ late and (miss) _______ her breakfast on Monday.

6. I (forget) ______ to turn off the stove after dinner. I (forget) ______ to turn off the stove a lot of times in my lifetime.

7. The children (hide) ______ in the basement yesterday. They (hide) ______ in the basement often since they (discover) ______ a secret place there.

8. The baseball player (hit) ______ the ball out of the stadium yesterday. He (hit) ______ a lot of homeruns since he (join) ______ our team.

9. We first (meet) ______ in 2001. So we (know) _______ each other for 8 years.

Упражнение 9. Put the verbs in brackets in the Past Simple or in the Present Perfect.

1. She (change) ______ a lot since she left school.

2 года назад

Предмет: История, автор: werfeew

якими були особливості природних умов стародавнього китаю
кратко, помогите пж дам 100 балов

2 года назад

Предмет: Химия, автор: annapotriynyi

ДАЮ 20 БАЛЛОВ
ХИМИЯ
ЗАДАЧА ЖИЗНИ И СМЕРТИ
ЗАДАЧА:
Знайти масову частку w розчиної речовини в розчині КОН. Де маса H2O 500г і маса розчиненої речовини KOH 100 г.

7 лет назад

Предмет: Математика, автор: unicorn29122009

Помогите пожалуйста все в приложении !!!!!!

7 лет назад

Скласти формули таких сполук за валентністю, срочноо ​

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Скласти формули таких сполук за валентністю, срочноо