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Winx1209
Winx1209
07.02.2020 03:27 •  Алгебра

Из трех текстов сделать один:
COMMUNICATING BY PHONE IN THE US
1. In phone booths in the US there are usually directions for using the telephone.
2. All phone numbers have seven digits plus three code digits.
3. There may be phone books - or directories - under the telephones.
4. There are two main kinds of long-distance calls: dial-direct and operator-assisted.
5. You can make direct dial calls in most parts of the US.
6. To make a long distance call, you'll need to know the three-digit area code.
7. There is an area code map of the US and Canada in the front of the White Pages on the phone book.
8. Phone books have white, blue and yellow pages.
9. The White Pages list people of the city with phones by last name.
10. The Blue Pages contain numbers of city services and other public services like public schools, public hospitals and so on.
11. You can found number of business and professional services on the Yellow Pages.
12. Pay phones have numbers in the US.
13. This means you can make a call to a friend at a phone booth.
14. Or if you run out of money, give the number your phone to the person you're talking to.
15. Then hang up receiver and they can call you back.
16. If you don't have enough money you can try "Collect call" service, which means that person whom you are calling will have to pay for it.

TELEPHONE ETIQUETTE
1. The techniques of telephoning are the same in all countries.
2. We should remember some telephone manners:
3. We should speak clearly, not too fast, not too slowly.
4. A smile will make your voice pleasant, friendly, accommodating, and attending.
5. If you found to a busy person make your conversation as brief as possible.
6. When calling a friend or a person who knows you but does not recognize your voice - don't play a guessing game.
7. Announce yourself promptly.
8. When you get a wrong number you should ask: "Is this two-three-four-five-six?"
9. If not - apologize.
10. You should not lose your temper it a wrong-number call comes through.
11. Simply say: "Wrong number" - and hang up.
12. If you have a visitor, do not carry on a long chat.
13. The best thing to do is to say you are busy at the moment and call back.
14. But don't forget to do so.

THE TELEPHONE DEPARTMENT
1. When guests stay at the hotel, they often use phones.
2. There is usually the regular pay phone and the house phone.
3. The house phone is the system of phones throughout the hotel.
4. There is usually an operator who operates the switchboard.
5. The operator can controls all in-coming and out-going calls.
6. The operator can connect the guest with any hotel service: the front office, the housekeeping, the bell service, the room service, or the concierge.
7. The operator handles outside calls too.
8. They may be local, long-distance and international.
9. The operator can take а message for the absent guest.

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Ответ:
Nastya20081505
Nastya20081505
07.02.2020

1. При последовательном соединении резисторов их общее сопротивление равно сумме всех сопротивлений.

R = R₁ + R₂ = 50 + 100 = 150 Ом


2. При параллельном соединении резисторов с разным сопротивлением, общее сопротивление будет всегда меньше значения самого маленького отдельного резистора.

\dfrac{1}{R}=\dfrac{1}{R_1}+\dfrac{1}{R_2}~~~\Leftrightarrow~~~ R=\dfrac{R_1R_2}{R_1+R_2}=\dfrac{30\cdot70}{30+70}=21 Ом.


3. A = U * I * t = 12 * 5 * (10*60) = 36000 Дж = 36 кДж


4. Q=\dfrac{U^2t}{R}=\dfrac{220^2\cdot1}{38.7}=1250 Дж.


5. R = U/I ;  R = p*L/S   ⇔   U/I = p*L/S

p = U*S/(L*I) = 120*0.24*10⁻⁶/(16*4) = 0.45 Ом*мм²/м

по таблице удельных сопротивлений находим материал:  Никелин.

4,6(82 оценок)
Ответ:
Камила15111
Камила15111
07.02.2020
Стандартный вид это когда приведены подобные и все сосчитано , так?
раскрываем скопки
** вторая степнь
***третья степень
2k**+6k-3k-6+k-2k**-5+10k
2k** и -2k** уходят тк при сложении =0
ответ: -6k-11

первую скопку раскрыть , у остальных в начале минус -это вирус , выворачиваем , а последнюю не трогаем
5x-5y-x+y-x-y (5x-y)
перед скопкой у , множим содержимое скобок на у (** - вторая спень)
5x-5y-x+y-x-y-5xy-y**
приводим подобные (мухи котлеты отдельно ) +y-y=0
3x-5y-5xy-y**
-5у и -у** степени разные и мы не могем их сложить
4,6(40 оценок)
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