Предмет: Математика, автор: kayerka228

8 (7a-6)-7 (8a+6)= -90.
Дайте пошаговое решение​

Приложения:
kayerka228: спасибо

Ответы

Автор ответа: milqawix
1

Пошаговое объяснение:

8(7a-6) - 7(8a+6)=-90

56a-48-56a-42=-90

-48-42=-90

-90=-90

a=R (любое значение а)

kayerka228: Любое значение кроме нуля?
milqawix: ноль тоже подходит
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ДАЮ 10 БАЛОВ
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1. Did you see / have you seen my book anywhere? I can’t find it.

2. I have done / did my homework. Now I can go for a walk.

3. We didn’t play / haven’t played football yesterday.

4. Someone has eaten / ate all the cakes. I’ll buy some more.

5. Children have visited / visited their Granny three days ago.

6. When did you help / have you helped your parents about the house?

2. Выберите правильный предлог.

1.Watch … !There are a lot of insects in the jungle. (for/to/out)

2.Yesterday Jack took his dog … the vet. (to/for/ with)

3.As usual the monkeys were full … fun. (at/ in/of)

4. Would you like to join … the “Adopt an Animal” programme?. (for/ of/ -)

5.This society fights … cruelty to animals. (against/ with/ for)

6.She likes to listen … pop music.(of/ to/ with)

3. Найдите лишнее слово.

1.Science, History, Christmas, Maths, Physical Education

2.day, week, language, year, month, minute

3.square, street, queen, bridge, park, garden

4.stay, play, study, party, pay

5.museum, king, monument, building, tower

4. Составьте предложения.

1.Trafalgar, I, never, to, been, Square, have.

2.Letter, has, Mike, already, that, read.

3.Has, he, not, aunt, visited, his.

4.Invited, we, just, have, friends, our.

5.Have, work, finished, children, already, their.

6.Mother, visited, her, I, already, have.

5. Исправьте ошибки в предложениях.

1. When he is leaving?

2. Where she lives?

3. Does he can speak German?

4. Did he came to you?

5. They married?

6. Вставьте слова в предложения.

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b)Palace.

c)bridge3. You have an interesting social … .

d)Information4. Linda Silvester is giving an … to a youth magazine.

e)programme5. A … is the main city in a country.

6. Who lives in Buckingham … ?

g)capital

7. Выберите правильную форму глагола.

1.I usually … detective stories and books on history.

a)shall read b)read c)am reading

2.I … very hard at school last year.

a)worked b)shall work c)work

3.Our local football team … abroad last year.

a)will go b)wentc)go

4.How many new subjects … you … at school next year? a)do… study b)will…studyc)studied

5.They … a lot of questions last Monday.

a)ask b)will ask c)asked

8 . Выберите правильный предлог.

1.They invited us … London (at/to/in).

2.Who takes care … your pet (about/for/of)?

3.Will you go abroad …October (at/in/on)?

4.My best pen-friend is … Britain (from/out of/in).

5.We arrived at the station … time (in/from/at).

9.Составьте разделительный вопрос.

1.Your parents aren’t doctors, …?

2.They are going to study Literature, …?

3.His friend can speak English very well, … ?

4.You don’t need any help, … ?

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6.He will do his homework tomorrow, … ?

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2.my pet, have, I, already, fed.

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