Предмет: Алгебра, автор: GermanLegenda

Пожалуйста: разложить на множители методом группировки $21a^{3} +8a^{2} b-5ab^{2} +2b-6a$

Ответы

Автор ответа: bb573878

Ответ:

Объяснение:

$\displaystyle\\21a^3+8a^2b-5ab^2+2b-6a=\\\\=21a^3+15a^2b-7a^2b-5ab^2+2b-6a=\\\\=3a(7a^2+5ab-2)-b(7a^2+5ab-2)=\\\\=(7a^2+5ab-2)(3a-b)$

GermanLegenda: Cпасибо

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: c0mandos228

1. We've got _______ eggs. We can't make an omelette.
A. little
Б. much
B. very few
Г. a lot of
2. I have _______ finished my homework but mark is still doing his.
A. for
Б. yet
B. ever
Г. already
3. There is _______ sugar in the bowl.
A. -----
Б. a
B. the
Г. some
4. Укажите лишнее
А. She was not ill yesterday .
Б. My uncle hasn't got a car.
B. Five years ago they were young.
Г. He didn't have any money.
5. Укажите верный вариант
A. Grandpha do you had a TV when you are five?
Б. Grandpha did you had a TV when you was five?
B. Grandpha did you have a TV when you were five?
Г. Grandpha had you a TV when you have be five?
6. The children are in the garden. They _________ football.
A. play
Б. are playing
B. were playing
Г. have playid
7. ______ moon isn't _________ planet.
A. the, а
Б. а, the
B. ------, the
Г. the ,------
8. Укажите верный вариант
A. They are going to visit the zoo on Saturday.
Б. He is going playing tennis now.
В. Have you never spoken to Jim about your plans yet?
Г. Peter has broke his leg yesterday
9. How long ago ________ your grandparents?
A. you visit
Б. have you visit
B. did you visit
Г. are you visiting
10. What time _______ this morning?
А. you get up
Б. get you up
В. have you get up
Г. did you get up
11. Укажите верный вариант
А. They decided sell their farm.
Б. They decided selling to their farm.
В. They decided to sell theirs farm.
Г. They decided to sell their farm.
12. That ________ name is Melane?
А. girl
Б. girl's
В. girls'
Г.girls's
13. Do you think it ___________ tomorrow?
А. rained
Б. has rained
В. be raining
Г. will rain
14. Karen _______ her hair every day.
А. washes
Б. is washing
В. has washin
Г. did washed
15. Укажите правильный вариант
А. There are wolfs in the forest.
Б. My bicycle has got two wheel.
В. There's some money in my pocket.
Г. They go to the school every day.

1 год назад

Предмет: Английский язык, автор: zsergn

Помогите ответить на вопросы по тексту?
We live on the earth. It is very, very big. There is a lot of water on the earth. It is in rivers, lakes, seas and oceans. There are a lot of forests and fields, hills and mountains on it. The earth is full of wonders. Different animals live on the earth. Different plants grow on it. The earth is beautiful. There are large countries and small countries. There are warm countries and cold countries. There are some countries where there are four seasons in a year and some countries where there are only two. When the sun shines it is day. When the sun does not shine it is night. When it is day in one country it is night in another. You can see the moon and the stars in the sky at night. People live in different countries. They speak different languages. Our country is one of the largest in the world. It is so large that when it is morning in the east, it is evening in the west. People who live in our country speak more than two hundred different languages.
Answer the questions.
Where do people live?
Is the earth big or small?
What is there on the earth?
Where is there water on the earth?
How many oceans are there on the earth?
What are the forests full of?
What are the oceans full of?
What is there on the mountains?
The earth is beautiful, isn't it?
Why?
How do you know that the earth is big?
Why do we say that the earth is full of wonders?
When ea n you see the sun in the sky?
When can you see the moon in the sky?
Are there a lot of countries in the world?
What languages do people in different countries speak?
What country do you live in? What is the largest country in the world?

1 год назад

Предмет: Русский язык, автор: наза9

Иногда бывает так жарко, что не можешь дышать.(характеристику предложений напишите плиз)

1 год назад

Предмет: Литература, автор: demiurgoskol

миф о посейдоне кратко

7 лет назад

Предмет: Литература, автор: grigorit666

приведите примеры образности пословиц и поговорок

7 лет назад