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27 tháng 9 2022

\(a,=-\left(x^3-3x^2y+3xy^2-y^3\right)\\ =-\left(x-y\right)^3\\ b,=\left(5-x\right)^3\)

29 tháng 9 2022

Bài 1:

b) 125-75x+15x2-x3= (5-x)3

Bài 2:

b) x3-12x2+48x-64=0

⇔ (x-4)3=0

⇔x-4=0

⇔x= 4

27 tháng 9 2022

`(a-b+c)^2`

`=[(a-b)+c]^2`

`=(a-b)^2+2c(a-b)+c^2`

`=a^2-2ab+b^2+2ac-2bc+c^2`

`=a^2+b^2+c^2-2ab+2ac-2bc`

a^2-2ab+2ac+b^2-bc+c^2-cb

27 tháng 9 2022

`6x(x-2)-(6x^2+4)=8`

`<=>6x^2-12x-6x^2-4=8`

`<=>-12x=12`

`<=>x=-1`

____________________________________

`4(x+2)^2-(2x+1)(2x-1)=1`

`<=>4x^2+16x+16-4x^2+1=1`

`<=>16x=-16`

`<=>x=-1`

- Tác giả sử dụng biện pháp tu từ ẩn dụ chuyển đổi cảm giác "Tình yêu từ trái tim cụ già đã chảy trong tim anh"

-Tác dụng:

+ Khiến câu văn dạt dào cảm xúc chạm vào trái tim người đọc

+ Gợi liên tưởng độc đáo

+ Cho thấy tình yêu thương của cụ già đã mang đến ấm áp và hạnh phúc trong trái tim đang dần nguội lạnh của "anh"

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27 tháng 9 2022

VD : 6.1 Ta có f(x) = 4x2 - 6x + a \(⋮\) x - 3

Khi đó 4x2 - 6x + a = (x - 3).P(x) 

=> x = 3 là ngiệm của f(x)

Khi đó f(3) = 4.32 - 6.3 + a = 0 

<=> a = -18 

6.2 f(x) = 2x2 + x + a \(⋮x+3\) 

=> f(x) = (x + 3).P(x) 

=> x = -3 là nghiệm của f(x) 

Khi đó f(-3) = 2(-3)2 + (-3)+ a = 0 

<=> a = -15 

6.3 f(x) = x3 + ax2 + 4 \(⋮\) (x + 2)2 

=> f(x) = (x + 2)2.P(x) 

=> x = -2 là nghiệm của f(x) 

Khi đó f(-2) = (-2)3 + a(-2)2 - 4 = 0 

<=> a = 3

AH
Akai Haruma
Giáo viên
27 tháng 9 2022

Bạn cần làm gì với đa thức này?

27 tháng 9 2022

F(x) = 4x4 - 4x3 - 7x2 - 4x + 4

xét hệ số tự do: 4 ta có: Ư(4) = {-4; -2; -1; 1;2; 4} 

F(2) = 4.24 - 4.23 - 7.22 - 4.2 + 4

F(2) = 64 - 32 - 28 - 8 + 4 = 0

theo bezout ta có: F(x) ⋮ (x-2)

F(x) : (x-2) = 4x3 + 4x2 + x - 2

vậy 4x4 - 4x3 - 7x2 - 4x + 4 = (x-2)(4x3 + 4x2 +x-2) 

Viết lại các câu sau sử dụng cách nói gián tiếp. 1. "Open the door," he said to them. - He told them................................................................... 2. "Where are you going?" he asked her. - He asked her where......................................................... 3. "Which way did they go?" he asked. - He asked... ...................................................................... 4. "Bring it back if it doesn't fit", I said to her. - I told......
Đọc tiếp

Viết lại các câu sau sử dụng cách nói gián tiếp.

1. "Open the door," he said to them.

- He told them...................................................................

2. "Where are you going?" he asked her.

- He asked her where.........................................................

3. "Which way did they go?" he asked.

- He asked... ......................................................................

4. "Bring it back if it doesn't fit", I said to her.

- I told... ............................................................................

5. "Don't try to open it now," she said to us.

- She told... ........................................................................

6. "Is it going to be a fine day today?" I asked her.

- I asked her... ....................................................................

7. "He's not at home", she said.

- She said that... .................................................................

8. "Is the bus station far away?" the girl asked.

- The girl wanted to know... ..............................................

9. "Don't stay out late, Ann" Tom said.

- Tom told Ann... ...............................................................

10. "Please let me borrow your car," he said to her.

- He asked... ........................................................................

11. "Jean, have you seen my gloves?" Thomas asked.

- Thomas asked Jean.....

12. Don't leave the window open, Mary", I said.

- I told Mary.... ...................................................................

13. "I'll have a cup of tea with you," she said.

She said that................................................................

14. "I'll pay him if I can" she said.

- She said that... ...................................................................

15. "What are you going to do next summer?" she asked.

- She asked us.... ...................................................................

16. "I'll phone you tomorrow," he told Jack. 

- He told Jack that.... ............................................................. 

17. "Can I sit beside you, Jean?" Tom asked.

- Tom asked Jean.... .............................................................. 

18. "I want a camera for my birthday," he said. 

- He said that.... ................................................................... 

19. "Don't keep the door locked," he said to us. 

- He told us.... ...................................................................

20. "How long are you going to stay?" I asked him. 

- I asked him how long.... 

21. "Are you going by train?" she asked me. 

- She wanted to know.... .................................................. 

22. "Don't use too much hot water," she said to us.

- She asked us.... ..............................................................

23. "Will you come to my party?" she said to me.

- She invited me.... ............................................................

24. "Don't do it again," she said to them.

She told them..................................................................

25. " Did Mr Brown send the potatoes to you?" she asked.

- She asked.......................................................................

26. "Don't get your shoes dirty, boys," she said.

- She told..........................................................................

27. "What do you want for lunch today, Peter?" Mary asked.

- Mary asked.......................................................................

28. "Can I borrow your typewriter, Janet?" asked Peter.

- Peter asked if .......................................................................

29. "When was your little boy born?" said the nurse to Mrs. Bingley.

- The nurse asked Mrs. Bingley...............................................................

34. "You should take more exercise, Mr. Robert," the doctor said.

- The doctor advised................................................................................

30. "When is the first day of your holiday, Peter?" Martha asked.

- Martha asked Peter when...................................................................

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