Предмет: Алгебра, автор: 20dimastar15

o 2 Разложите на множители: а) у² - у + 2y - 2; б) 4а² - c²; в) аb² + 2ab + а³.​

Ответы

Автор ответа: sergeevaolga5
2

y^2-y+2y-2=(y^2-y)+(2y-2)=y(y-1)+2(y-1)=(y-1)(y+2)\\\\4a^2-c^2=(2a)^2-c^2=(2a-c)(2a+c)\\\\ab^2+2ab+a^3=a(b^2+2b+a^2)

Автор ответа: Аноним
0

\displaystyle 1)y^2-y+2y-2=y(y-1)+2(y-1)=(y-1)(y+2)\\\\2)4a^2-c^2=2^2a^2-c^2=(2a)^2-c^2=(2a-c)(2a+c)\\\\3)ab^2+2ab+a^3=a(b^2+2b+a^2)

Похожие вопросы
Предмет: Русский язык, автор: гул29
Предмет: Английский язык, автор: dimaxanter
Помогите плиз сделать контрольную по АНгл языку
1. Вставьте some, any, no, something, anything, nothing, everything, somebody, anybody, nobody, everybody по смыслу:

1. There is … ink in my pen. 2. Is there … snow in the street this morning? 3. My mother likes … music. 4. … is all right, the patient is better today. 5. Is there … interesting in the programme of the concert? 6. I could see ...: it was quite dark. 7. Give me ... to drink. 8. Has … in this group got a dictionary? 9. … left a magazine in our classroom yesterday. 10. Are there … mistakes in my dictation? 11. There were … students of our group at the consultation yesterday. 12. People need … oxygen for breathing. 13. My new eyeglasses are very good, I can see … now. 14. I saw … near the wood that looked like a tent. 15. I don’t know … about this town. 16. I could see …: it was dark. 17. Please tell us the story. … knows it. 18. Has … here got a red pencil? 19. Would you like … tea? 20. It happened … years ago.
2. Дайте правильную форму глагола “to be”:

1 . I (to be) Peter. ___________

2. Не (to be) John. ___________

3. We (to be) friends. ___________

4. My mother (to be) a doctor last year. ___________

5. Her father (to be) a teacher next month. ___________

3. Выберите местоимение:

1.... books are on the table. (we, our) ___________

2 .... dress is on the chair. (she, her) ___________

3 .... son is at school. (they, their) ___________

4 .... teacher is at the table. (we, our) ___________

5. The walls of the room are white.... walls are white. (it, its) ___________

4. Поставьте артикли a/an или the там, где необходимо.

1. I’d like … chicken sandwich and … glass of … mineral water.

2. Would you like … banana or … strawberries?

3. She always has … apple, … toast and … cup of … coffee for … breakfast.

4. The fly is on … ceiling in … kitchen.

5. My mother is … accountant and my father is … lawyer. They work in … same company in … centre of … our town.

6. How much are … her Italian lessons? – Ten dollars … hour.

7. Where are … dogs? – They are in … garden.

8. … cats like eating … fish. … cows like eating … grass. … birds like eating … insects.

9. My favourite subjects are … chemistry and … biology.

10. There is … parrot in … cage. And there are … pieces of … fruit in it
5. Выберите правильный вариант ответа:

1. The clothes are absolutely wet. I should dry … .

A. it C. them

B. their D. theirs

2. He decided to save some money and put … in the bank.

A. it C. them

B. their D. its

3. The information is top secret, so naturally, everybody is interested in … .

A. them C. it

B. they D. their

4. … women over there all speak Chinese.

A. that C. those

B. this D. these

5. I would like some grapes for dessert. Will you buy …?

A. it C. they

B. its D. them

6. The new pair of trousers … a bit tight on me.

A. are C. were

B. is D. am

7. … are only seven stations on this metro-line.

a. These c. There

b. It d. This

8. … there any news in your parent’s letter?

a. Are c. Have

b Were d. Is

9. … something strange in this situation.

a. there is c. this is

b. it is d. that is

10. … snow on the top of the mountain peak.

a. There is c. Here is

b. It is d. What is