Предмет: Математика, автор: timurchik1497

Решите пожалуйста....

Приложения:

Ответы

Автор ответа: LFP
0

16) b(n+1) = b(n) * q => q = -1/2

b7 = 6 = b1 * q^6 = b1 * 1/64

b1 = 64*6

b10 = b1 * q^9 = 64*6 * (-1/2^9) = - 3*2^7 / 2^9 = -3/4

17) ответ---четвертое 6_3/4 = 27/4 = 3^3 / 4 => 3 = n+1 => n=2

(n должно быть НАТУРАЛЬНЫМ числом)

18) четвертое

16 = 4^2 = (-4)^2 --- является

-1024 = -(4^5) = (-4)^5 --- является

-64 = -(4^3) = (-4)^3 --- является

-256 = -(4^4) = (-4)^4 = 256 --- НЕ является

19) a3 = a1 * q^2 = 2 => a1 = 2/q^2

a6 = a1 * q^5 = 1/4 = 2q^5 / q^2 = 2q^3

q^3 = 1/8

q = 1/2

 
Похожие вопросы
Предмет: Английский язык, автор: rustem123467
1. Put the verb in brackets into the correct form (either the infinitive or gerund form). The man admitted (steal)________ the mobile phone from the shop. *
1 балл
2. Put the verb in brackets into the correct form (either the infinitive or gerund form). The question is easy (answer)_____. *
1 балл
3. Put the verb in brackets into the correct form (either the infinitive or gerund form). She doesn't mind (work)_____ the night shift. *
1 балл
4. Put the verb in brackets into the correct form (either the infinitive or gerund form). He agreed (buy)______ a new car. *
1 балл
5. Put the verb in brackets into the correct form (either the infinitive or gerund form). We regret (announce) ______the late arrival of the 12.45 from Paddington. *
1 балл
6. Put the verb in brackets into the correct form (either the infinitive or gerund form). I remember (switch off) ______the lights when I went on holiday. *
1 балл
7. Choose the correct answer. ____ everyone already knows each other, there’s no need for introductions. We’ll get straight into the business of the meeting. *
1 балл
a) For
b) now
c) as
8. Choose the correct answer. A person of ____intelligence is a pleasure to meet. *
1 балл
a)Such an
b) such
c) such a
a) so
9. Choose the correct answer. She’s tired because she ___ all day. *
1 балл
A)shopped
B) shops
C) has been shopping
D) has shopped
10. Choose the correct answer. Sorry. I ___ one of your glasses. *
1 балл
A)have broken
B) broke
C) break
D) have been breaking
11. Choose the correct answer. I _____ a cake, that's why the kitchen is such a mess. *
1 балл
a) am making
b) have been making
c) has made
d) make
12. Choose the correct answer. Mmm! That ____(smell) nice. What is that? *
1 балл
a) is smelling
b) smells
c) has smelled
d) has been smelling
13. Choose the correct answer. The climate _____rapidly. *
1 балл
a) changes
b) has been changing
c) is changing
d) have changed
14. Choose the correct answer. The Earth ____round the Sun. *
1 балл
A) is revolving
b) has revolved
c) revolves
d) has been revolving
15. Choose the correct answer. I am afraid I _____ (not/know) the answer to the question. *
1 балл
A) am not knowing
b) haven’t known
c) don’t know
d) have not been knowing
16. Choose the correct answer. I _____(need) some new clothes for the winter. *
1 балл
a) am needing
b) need
c) have needed
d) have been needing
17. Choose the correct answer. We had to adapt our plans ___ fit Jack's timetable. *
1 балл
A) for
b) to
c) at
d) with
e) of
18. Choose the correct answer. Environmental _____has increased dramatically over the past decade. *
1 балл
a) withstand
b) appliance
c) awareness
d) chore
e) receipt
19. Choose the correct answer. ______the trains in the timetable. *
1 балл
a) Look out
b) Look for
c) look into
d) Look after
e) Look up
20. Choose the correct answer. They stood on the street corner giving out leaflets. *
1 балл
a) giving away
b) giving off
c) giving in
d) giving back
e) giving out