Предмет: Алгебра, автор: love19971

Найдите сумму десяти первых членов геометрической прогрессии (bn) , если ее первый член равен 8 , а знаменатель равен 2
Помогите пожалуйста :(

Ответы

Автор ответа: Nikk1994
0
S(сумма)=(b1(1-q^n))/1-q
S=(8(1-2^10))/(1-2)=(-8*1023)/(-1)=8*1023=8184
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1.
Underlined word is: Here is some advice for those preparing to go on holiday.



Pronoun
Negative pronoun
Preposition
An Adjective

2.
Incorrect written number



fifteen
fifty
fiveteenth
fifth

3.
Find the adjective which is formed from a noun:





Smoker
Different
Decision
Painless

4.
An appropriate preposition: Where do you usually get…?





over
off
on
away

5.
Change into indirect speech: “What’s the time”? She asked.



She asked what was the time.
. She asked what’s the time.
She asked what time it was.
She asked what time.

6.
Fill in a suitable form of the verb: She … they would finish the work soon.



Promised
promising
Promises
Promise

7.
Appropriate answer: Our teacher wishes he ___ another profession.



chose
had chosen
will choose
has chosen

8.
The synonym of the word ‘’Remain” is:



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Stay.
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Leave.

9.
The antonym of the word ‘’Truth” is:



Shock
Mark
Lie
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Choose the correct translation into Russian: Во дворе много деревьев.



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There are many trees in the yard.
There many trees in the yard.
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11.
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A) is B) are C) am D) will be

am
are
will be
Is

12.
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14.
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15.
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16.
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the/ the
a /an
- / the
a/a

17.
Correct use of the articles

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the, a
a, the
a,-
a, a

18.
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19.
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Adjectives of material :





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Present Perfect Passive form:





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D) when
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Complex Object.





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Sentence with Perfect Infinitive





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