Предмет: Математика, автор: Nana2997

В арифметической прогрессии сумма третьего и седьмого членов равна 10, первый член равен -3. Найти разность прогрессии.

Ответы

Автор ответа: Кротилла

$n_3+n_7=10$
преобразуем
$n_1+2d+n_1+6d=10$ где d-разность АП
$2n_1+8d=10$
$2*(-3)+8d=10$
$8d=10-(-6)$
$8d=16$
$d= \frac{16}{8}$
$d=2$

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: БогданРепников

ещё раз плиз помогите с английским 5.2 и 5.3

2 года назад

Предмет: Немецкий язык, автор: annapetrovna95

Setzen Sie das eingeklammerte Verb ein, gebrauchen Sie dabei «zu», wo es nötig ist.
1. Gehst du in den Laden Brot und Zucker … (kaufen)?
2. Es ist gesund, am Abend einen Spaziergang … (machen).
3. Wir begannen schon … (kochen).
4. Warum lassen Sie den alten Fernseher nicht … (reparieren)?
5. Ich hoffe, Sie bald … (wiedersehen).
6. Ich habe heute keine Zeit, den Brief zur Post … (tragen).
7. Du brauchst den Text nicht … (übersetzen).
8. Hast du Lust, Tischtennis … (spielen).

2 года назад

Предмет: Русский язык, автор: Angela20171

Помогите с заданием 254

2 года назад

Предмет: Математика, автор: enechaevf

x*6=33*2 решить уравнения

8 лет назад

Предмет: Английский язык, автор: lolikbanan22

умоляю помогите
1. A _______________ is a list of the chapters or sections given at the front of a book or periodical.
2. A ________________ is the end or finish of an event, process, or text.

1) conclusion 2) content
1) content 2) conclusion

1. An __________ is a view or judgement formed about something, not necessarily based on fact or knowledge.
2. An _______________ is a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.

1) encyclopedia 2) opinion
1) opinion 2) encyclopedia

1. A _____________ is a book of information about a place, designed for the use of visitors or tourists.
2. A _____________ is a person in a novel, play, or movie.

1) guidebook 2) character
1) character 2) guidebook

1. A ___________ is a novel, play, or film with an exciting plot, typically involving crime or espionage.
2. A ___________ is a book giving instructions or information.

1) manual 2) thriller
1) thriller 2) manual

1) A ______________ is an account of someone's life written by someone else.
2) A ____________ is a person who has written something or who writes in a particular way.

1) biography 2) writer
1) writer 2) biography

Choose the correct verb form to complete these sentences.

1) He ...... documents by the time the boss came.

had prepared
prepared

Open the brackets with the past simple or the past continuous.

Choose the correct answer.

1) Who (you wait) ____ for when I arrived?

were you waiting
did you wait
you were waiting
you waited

2) When I was young I (want) ____ to be a pilot.

wanted
were wanting
had wanted
was wanting

3) She was a beautiful woman. She always (attract) ____ a lot of men.

attracted
was attracted
atracted
was attracting

4) (be) it ____ difficult to find a new job?

Was it being
It was
Was it
Were it

5) I (not have) ____ time to see my parents last week.

did not have
were not having
was not having
had not

6) Jane (not be) ____ at home yesterday evening.

was not
were not
was not being
not was

7) What (be) ____ the flight like?

was being
were being
were
was

2) I can't get into my house because I ...... my keys yesterday.

lost
have lost

3) He ...... a letter by 6 pm yesterday.

has wrote
had written

8 лет назад