Предмет: Алгебра, автор: vkulchak

Решите пожалуйста!
а)4.2^{0}-5^{3}*5^{-1}
б) 2^{-10}* 2^{8}
в)(b^{7})^{-4}
г) a^{-12}: a^{-10}
д)( 5^{-4}) ^{2}* 5^{2}

Ответы

Автор ответа: Artem112
2
a^0=1
\\\
a^m\cdot a^n=a^{m+n}
\\\
a^m:a^n=a^{m-n}
\\\
(a^m)^n=a^{mn}

4.2^0-5^3\cdot5^{-1} =1-5^{3-1} =1-5^2=1-25=-24
\\\
 2^{-10}\cdot 2^{8} = 2^{-10+8}=2^{-2}= \frac{1}{2^2} = \frac{1}{4} 
\\\
(b^{7})^{-4} =b^{7\cdot(-4)}= b^{-28}= \frac{1}{b^{28}} 
\\\
 a^{-12}: a^{-10} = a^{-12-(-10)}= a^{-12+10}=a^{-2}= \frac{1}{a^2} 
\\\
( 5^{-4}) ^{2}\cdot 5^{2} = 5^{-4\cdot2+2}=5^{-8+2}=5^{-6}= \frac{1}{5^6} =\frac{1}{15625}
Похожие вопросы
Предмет: Русский язык, автор: nastyakuzina0
Предмет: Английский язык, автор: amura20
помогите с англ.яз.
Task 2.

Read the situations and make sentences from the words in brackets. Use Past Perfect.

1) You went to Jill's house but she wasn't there. (she/go/out) She ________________________.

2) You went back to your home town after many years. It wasn't the same as before.

(it/change/a lot) It _______________________________________________________.

3) I invited Rachel to the party but she couldn't come.

(she/arrange/to do something else) She ____________________________________________.

4) You went to the cinema last night. You arrived at the cinema late.

(the film/already/begin) The film _________________________________________________.

5) I was very pleased to see him again after such a long time.

(I/not/see/him for five years) I ___________________________________________________.

6) I offered Sue something to eat but she wasn't hungry.

(she/just/have/breakfast) She ____________________________________________________.



Task 3.

Open the brackets and put the verbs into Past Simple or Past Perfect.

1) Helen ________________________________________ (to return) from the cinema at 6 p.m.

2) I ________________________________________ (to finish) my homework by eight o’clock.

3) He __________________________ (to think) that he ________________ (to lose) the money.

4) Ann ______________ (to tell) me that she ___________________ (to see) an interesting film.

5) When I _______________ (to come) home, mother ______________ (not to cook) dinner yet.



Task 4.

Open the brackets and put the verbs into Past Perfect Continuous.

1) Sally ___________ (type) this text for 3 hours before Mark came.

2) Anthony _________ (wait) for his airplane for 3 hours when its delay was announced.

3) I saw many huge puddles. ______ it_______ (rain) hard?

4) Sam did not even realize what a hard time Molly ______ (have).

5) Rita _______ (train) for a year and she was very fit when her ex-boyfriend met her.

6) Paul and Molly ___________ (talk) on the phone for an hour when the line broke.

7) How long ____________ you_________ (watch) TV before you decided to go to bed?

8) Steven felt tired as he __________ (sail) for several hours.
Предмет: Английский язык, автор: yashkovaangeli
Предмет: Русский язык, автор: sabitov950803