Ответ по предмету Математика: у класі навчається 12 хлопчиків і 10 дівчаток. Скількома способами можна вибрати 3-х учнів однієї статі?

Предмет: История, автор: yurchenkodarias

чому українське козацтво було конкурентом великоруській удеї

1 год назад

Предмет: Английский язык, автор: emshifox

1. We've decided to ______ ahead with our plans for a new office.
A. take B. go C. put. D. bring
2. They've _______ the meeting off until next week.
A. got. B. stopped. C. put. D. taken
3. Food prices have _____ up a lot recently.
A. changed. B. got. C. taken. D.gone
4. Do you think we should ____ together for a meeting?
A. get. B. bring. C. take. D. make
5. All the lights suddenly ____ off.
A. moved. B. got. C. put. D. went
6. I was ill last week, so I _____ a bit behind with my work.
A. went. B. came. C. got. D. turned
7. We don't like the temporary office location but we will have to ____ up with it until June.
A. live. B. put. C.take. D. turn
8. Everyone says I _____ after my father because we look alike and both love jazz.
A. look. B. go. C. take. D. do

1 год назад

Предмет: Физика, автор: jifsdohfyhgeb

Експериментально було визначено, що тривалість одного коливання маятника становить: у першому досліді 5,52 с; другому 5,9 с; третьому 5,67 с. Чому дорівнює виміряне значення даної величини? Відповідь надайте у вигляді числа без одиниць вимірювання, округливши результат до сотих.

1 год назад

Предмет: Физика, автор: tatyana0980

ДАЮ 100 БАЛЛОВ!

На поверхность серебра падает свет с длиной волны 155 нм. Работа выхода электрона из серебра 4, эВ. Скорость света 3*10^8 м/с, постоянная Планка h=6.62*10^-34 Дж*с , 1 эВ= 1,6∙10^-19 Дж

a) Найти частоту, соответствующую красной границе фотоэффекта

b) определи частоту падающего света и сравни с частотой красной границы. По результатам сравнения докажи, что фотоэффект произойдет .

c) Определите максимальную кинетическую энергию фотоэлектронов;

d) Скорость фотоэлектронов, масса электрона 9,1*10^-31кг.

7 лет назад

Предмет: Английский язык, автор: Аноним

помогитее умоляяю
I. Complete the sentences. Use be going to or will/won’t.

1. Don’t ask Simon to fix the shelves. He … break them. He always does.

2. Hey! Watch out! That glass … fall off the table.

3. I think he … forget my birthday again this year.

4. Just look at this black sky. It …rain.

5. You look tired. I think I… wash the dishes.

6. The twins … be seven years old next year.

7. Oh, no! Look! Sally … fall off her bike.

8. The car’s out of control. I‘m afraid we… crash.

9. Perhaps we … meet again. Who knows?

10. Don’t worry about me. I…OK.

II. Open the brackets using Present Progressive, Future Simple or to be going to

1. My grandmother has decided what to do. She has bought tickets. She (leave) tomorrow.

2. I love London. I (probably / go) there next year.

3. What (wear / you) at the party tonight? I haven't made up my mind yet.

4. Look at these big black clouds! It (rain).

5. My sister doesn't know where to go. I think she (go) to Edinburgh next week.

6. Here is the weather forecast. Tomorrow (be) dry and sunny.

7. My mother bought the tickets to the opera, we (watch) Swan Lake this Saturday.

8. My parents decided what to do long ago. They (spend) their holiday in Brighton next month.

9. I'm not sure about the dates, but I (visit) Madagascar next summer.

III. Complete the sentences. Use be going to + one of these verbs: eat; give; lie down; stay; walk; wear; watch.

1. What ... to wear to the party tonight? 2. I don't want to go home by bus. I … . 3. John is going to London next week. He … with some friends. 4. I'm hungry. I … this sandwich. 5. It's Sharon's birthday next week. We … her a present. 6. Sue says she's feeling very tired. She … for an hour. 7. There's a good film on TV this evening … you … it?

IV. Complete the sentences: am, is, are, isn’t, aren’t

1. When … your friend visiting you today? 2. Peter and his elder brother …going fishing because of cold and windy weather. 3. They …playing football with a great team tomorrow. 4. Who …attending English courses next week? 5. I … washing dishes and cleaning the floor after his birthday. 6. Marry hasn’t bought her CD, she …listening to her favourite song in the evening. 7. Yesterday my sister got a bouquet of roses. Today she … watering them.

V. Put the words in the correct order.

1. me/ you/are/with/working/ tomorrow? 2. doing/i/homework/am/for Monday? 3. long/she/how/is/with/cooking/her mother/a dinner? 4. we/studying/are/these grammar rules/not.

помогите умоляю надо быстро

7 лет назад

у класі навчається 12 хлопчиків і 10 дівчаток. Скількома способами можна вибрати 3-х учнів однієї статі?

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