Предмет: Алгебра, автор: lovlyself

Между числами - 4 и 5 вставьте пять таких чисел, чтобы они вместе с данными числами образовали арифметическую прогрессию.​

Ответы

Автор ответа: bananachina13
0

Ответ:an = a1 + (n-1) * d

где an - n-й член прогрессии, a1 - первый член прогрессии, n - номер члена прогрессии, а d - разность прогрессии.

Так как известны первый и второй члены прогрессии, то можно найти разность:

d = a2 - a1 = 5 - 4 = 1

Теперь, зная разность прогрессии, можно находить остальные члены прогрессии:

a3 = a2 + d = 5 + 1 = 6

a4 = a3 + d = 6 + 1 = 7

a5 = a4 + d = 7 + 1 = 8

a6 = a5 + d = 8 + 1 = 9

a7 = a6 + d = 9 + 1 = 10

Таким образом, пять чисел, которые образуют арифметическую прогрессию вместе с числами 4 и 5, будут: 4, 5, 6, 7, 8, 9, 10.

Объяснение:

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1.After the teacher’s instructions the students opened their exercise books and ....
writing.
(Баллов: 1)

had started

started
2.He.... a lot of friendly people when he was in Greece.
(Баллов: 1)

meet

met

had met
3.We ....our grandparents last week.
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visited

had visited

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4.She (bake) a lot before she (open) her shop.

(Баллов: 1)

baked - opened

have opened - opened

had baked - opened
5.We (have) a lot of trouble because we (lose) our passports.
(Баллов: 1)

had had - lost

had - had lost

have - have lost
6.Brian (know) many people at the club because he (be) there many times.
(Баллов: 1)

had known - was

known - had been

knew-had been
7.They (study) English before they (move) to Canada.
(Баллов: 1)

studied - moved

studied - had moved

had studied - moved
8.She (enjoy) the movie because she (read) the book.
(Баллов: 1)

enjoyed - had read

had enjoyed - had read

enjoyed - read
9.Amy (study) a lot before she (take) the test.
(Баллов: 1)

studied - took

had studied - took

had studied - had taken
10.Chris (own) that car for 5 years before he (sell) it.
(Баллов: 1)

had owned - sold

owne - sold

had owned - had sold
11.They (have) a lot of trouble before they finally (succeed).
(Баллов: 1)

have had- succeeded

had had - succeeded

had - had succeeded

11/09 past tenses
Привет, Сидоренко Андрій. Когда вы отправите эту форму, владелец увидит ваше имя и адрес электронной почты.
1.After the teacher’s instructions the students opened their exercise books and ....
writing.
(Баллов: 1)

had started

started
2.He.... a lot of friendly people when he was in Greece.
(Баллов: 1)

meet

met

had met
3.We ....our grandparents last week.
(Баллов: 1)

visited

had visited

visit
4.She (bake) a lot before she (open) her shop.

(Баллов: 1)

baked - opened

have opened - opened

had baked - opened
5.We (have) a lot of trouble because we (lose) our passports.
(Баллов: 1)

had had - lost

had - had lost

have - have lost
6.Brian (know) many people at the club because he (be) there many times.
(Баллов: 1)

had known - was

known - had been

knew-had been
7.They (study) English before they (move) to Canada.
(Баллов: 1)

studied - moved

studied - had moved

had studied - moved
8.She (enjoy) the movie because she (read) the book.
(Баллов: 1)

enjoyed - had read

had enjoyed - had read

enjoyed - read
9.Amy (study) a lot before she (take) the test.
(Баллов: 1)

studied - took

had studied - took

had studied - had taken
10.Chris (own) that car for 5 years before he (sell) it.
(Баллов: 1)

had owned - sold

owne - sold

had owned - had sold
11.They (have) a lot of trouble before they finally (succeed).
(Баллов: 1)

have had- succeeded

had had - succeeded

had - had succeeded