Тема: Числовые последовательности. Помогите решить номер 2 букву а и б - №27425463

Тема: Числовые последовательности.
Помогите решить номер 2 букву а и б
- Предмет:
  Алгебра
- Автор:
  knox
- 5 лет назад

Ответы 1

a) A(n)=2ⁿ⁻³ n=1,2,3...b)A(n)=(-1)ⁿ*3n n=1,2,3...
- Автор:
  annalewis
- 5 лет назад
- 0
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Вопрос 1
I ... him for three years.
A. know;
B. was known;
C. have known;
D. has known.
Вопрос 2
The bridge . . . ten years ago.
A. is being built;
B. built;
C. was built;
D. is built.
Вопрос 3
If it … raining we will go for a walk.
A. stops;
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C. will have stopped;
D. stopped.
Вопрос 4
They … play golf every day.
A. don’t;
B. doesn’t;
C. hadn’t played;
D. wasn’t.
Вопрос 5
My brother … in the garden now.
A. is working;
B. works;
C. worked;
D. has been working.
Вопрос 6
They … since last holidays.
A. haven’t met;
B. didn’t meet;
C. don’t meet;
D. had met.
Вопрос 7
You promised that you … tickets for the new play.
A. will get;
B. would get;
C. got;
D. have got.
Вопрос 8
He … playing tennis tomorrow, because he is ill.
A. will not;
B. is not;
C. are not;
D. was not.
Вопрос 9
Why … to get there on time?
A. it is important;
B. is important;
C. is it important;
D. was important.
Вопрос 10
The letter . . . just... .
A. has been typed;
B. has typed;
C. is being typed;
D. is typing.
Вопрос 11
The steamer … still.
A. unload;
B. be unloaded;
C. is being unloaded;
D. will be unloaded.
Иностранный язык. Английский 1. v13aa05c0-407e-4f67-bfc5-f8c0f589b16e 4da650fd-d28b-4314-903e-95989acb77b3
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He said that he … met that man before.
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He … learning foreign languages all his life.
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When you … from the party give me a call please.
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Вопрос 19
How long … for me before I came?
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C. has she waited;
D. she waited.
Вопрос 20
She ... no letters from him lately.
A. has received;
B. received;
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