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Ta có: \(\left(x+2\right)\left(x^2+2x+2\right)-x\left(x-8\right)^2=\left(4x-3\right)\left(4x+3\right)\)

\(\Leftrightarrow x^3+2x^2+2x+2x^2+4x+4-x\left(x^2-16x+64\right)=16x^2-9\)

\(\Leftrightarrow x^3+4x^2+6x+4-x^3+16x^2-64x-16x^2+9=0\)

\(\Leftrightarrow4x^2-58x+13=0\)

\(\Leftrightarrow\left(2x\right)^2-2\cdot2x\cdot\frac{58}{4}+\frac{3364}{16}-\frac{789}{4}=0\)

\(\Leftrightarrow\left(2x-\frac{58}{4}\right)^2=\frac{789}{4}\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-\frac{58}{4}=\frac{\sqrt{789}}{2}\\2x-\frac{58}{4}=-\frac{\sqrt{789}}{2}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=\frac{\sqrt{789}}{2}+\frac{58}{4}=\frac{29+\sqrt{789}}{2}\\2x=-\frac{\sqrt{789}}{2}+\frac{58}{4}=\frac{29-\sqrt{789}}{2}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{29+\sqrt{789}}{4}\\x=\frac{29-\sqrt{789}}{4}\end{matrix}\right.\)

Vậy: \(x\in\left\{\frac{29+\sqrt{789}}{4};\frac{29-\sqrt{789}}{4}\right\}\)

10 tháng 8 2017

- Anh Dậu hoảng quá vội để bát cháo xuống phản và lăn đùng ra đó không nói được câu gì.

- Anh Dậu vội để bát cháo xuống phản và lăn đùng ra đó, hoảng quá, không nói được câu gì.

24 tháng 4 2019

The fridge is completely empty.

There is........................nothing.left ................................................in the fridge. ( left)

9 tháng 3 2023

(Tất cả các từ bạn cho đều thêm -ed vào đuôi)

1.want-wanted

2.pick-picked

3.plant-planted

4.clean-cleaned

5.water-watered

6.help-helped

 

Viết lại các câu sau sao cho nghĩa không đổi, sử dụng từ in đậm. 1.       Has she written to you lately?                                                 HEARD2.       My father is going to lend me his car tonight                                    BORROW3.       Somebody has stolen all Mary's jeweler.                               ...
Đọc tiếp

Viết lại các câu sau sao cho nghĩa không đổi, sử dụng từ in đậm.

 

1.       Has she written to you lately?                                                 HEARD

2.       My father is going to lend me his car tonight                                    BORROW

3.       Somebody has stolen all Mary's jeweler.                                ROBBED

 

4.       Why did you do that?                                                             FOR

 

5.       He was not listening to what we were saying                                    PAYING

 

6.       He was speaking so unclearly that I couldn't understand him.                   TOO

 

7.       The fridge is absolutely empty.                                      LEFT

 

8.       Nothing ever frightens him.                                           AFRAID

 

9.       Can you tell me the way to the Central Post Office.                DIRECT

 

10.     The bank now owns this block of flats.                                   BELONGS

 

11.     Everything went well that morning.                               NOTHING 

 

12.     Nancy always talk about her illness all the time                      NEVER

 

13.     Many of them had never been in a helicopter before.                                           TIME

 

14.     Yes, it's a great pity Mark isn't here.                                       WISH

1
12 tháng 8 2021

1.       Has she written to you lately?                                                 HEARD

Have you heard of her lately?

2.       My father is going to lend me his car tonight                                    BORROW

I am going to borrow my father's car tonight

3.       Somebody has stolen all Mary's jeweler.                                ROBBED

 Mary has been robbed all her jeweler

4.       Why did you do that?                                                             FOR

 What did you do that for

5.       He was not listening to what we were saying                                    PAYING

 He was not paying attention to what we were saying

6.       He was speaking so unclearly that I couldn't understand him.                   TOO

 He was speaking too unclearly for me to understand him

7.       The fridge is absolutely empty.                                      LEFT

 There is nothing left in the fridge

8.       Nothing ever frightens him.                                           AFRAID

 He is not afraid of anything

9.       Can you tell me the way to the Central Post Office.                DIRECT

 Can you direct me to the Central Post Office.      

10.     The bank now owns this block of flats.                                   BELONGS

 This block of flat belongs to the bank

11.     Everything went well that morning.                               NOTHING 

 Nothing went wrong that morning

12.     Nancy always talk about her illness all the time                      NEVER

 nancy never stops talking about her illness all the time

13.     Many of them had never been in a helicopter before.                                           TIME

 This was the first time many of then had been in a helicopter

14.     Yes, it's a great pity Mark isn't here.                                       WISH

I wish Mark were here

2 tháng 12 2018

a) Dùng chuột bôi đen chữ in đậm muốn chọn.

Nháy nút Bài thực hành 2 trang 96 SGK Tin học 4 | Giải bài tập Tin học lớp 4 hay nhất tại VietJack để chuyển in đậm thành in thường

b) Dùng chuột bôi đen chữ muốn chọn.

Nháy nút Bài thực hành 2 trang 96 SGK Tin học 4 | Giải bài tập Tin học lớp 4 hay nhất tại VietJack để chuyển chữ thường thành chữ nghiêng.

c) Có thể trình bày chữ vừa đậm, vừa nghiêng được.

6 tháng 1 2022

1. It is impossible for me to work in all this noise.

2. Would you mind not playing your music so loudly?

3. It makes no difference to me whether we have the meeting today or tomorrow.

4. It has been agreed that we will meet again in a fornight.

6 tháng 1 2022

giúp với ạ mình đang cần gấp

4 tháng 6 2021

Did James Watt invent the steam engine?

4 tháng 6 2021

Did James Watt invent the steam engine ?

VII. Viết lại các câu sau sao cho nghĩa không đổi, sử dụng từ in đậm.1.This tree will soon be as tall as our house.   same                         This tree will soon be .......2.My brother and I used to play badminton in the park every Saturday.    would               Every Saturday, my brother......3.The children ran over the bridge to see the fire engine, but it was no longer there.            byThe fire engine...
Đọc tiếp

VII. Viết lại các câu sau sao cho nghĩa không đổi, sử dụng từ in đậm.

1.This tree will soon be as tall as our house.   same                         

This tree will soon be .......

2.My brother and I used to play badminton in the park every Saturday.    would               

Every Saturday, my brother......

3.The children ran over the bridge to see the fire engine, but it was no longer there.            by

The fire engine had.......

4. She cried with happiness.   so                                                                                            

She was.......

5. Leo plays the piano so badly that no one can bear to listen to him.                       such   

Leo is ........

6.So many people wanted to go on the trip that we had to hire another bus.                        number

We had to hire .......

7. Jane is so confident that she makes friend easily. got                                                      

Jane makes friend easily because ............

8.What do you intend to do with all that money?                  are                               What.............................................................................?

9. He drives so dangerously that it frightens me.                   such                                       

He .................

10. Hardly anyone attended the meeting so we went home.             few                                         

There were ....................

 

VIII. Điền giới từ hoặc trạng từ vào chỗ trống     

1. He hasn't got ... that bad heart attack completely.

2. You are very late. Now we'll have to work hard to make up .... lost time.

3. The meeting has been  put ..... until next week.

4. Please come in. Take ..... your coat and make yourself comfortable.

5. She resembles her mother both.... look and character.

6. I can't say ..... certainty when he'll back.

7. They decide to put the house ... sale.

8. Her teaching style is similar.... that of most other teachers.

9. We gained independence .... the French in 1945.

10. Modern farming methods can have an adverse effect ...... the environment.

1
22 tháng 7 2021

VII. Viết lại các câu sau sao cho nghĩa không đổi, sử dụng từ in đậm.

1.This tree will soon be as tall as our house.   same                         

This tree will soon be ...the same height as our house....

2.My brother and I used to play badminton in the park every Saturday.    would               

Every Saturday, my brother....and I would play badminton in the park ..

3.The children ran over the bridge to see the fire engine, but it was no longer there.            by

The fire engine had.. left by the time the children ran over the bridge.....

4. She cried with happiness.   so                                                                                            

She was....so happy that she cried...

5. Leo plays the piano so badly that no one can bear to listen to him.                       such   

Leo is ...such a bad pianist that no one can bear to listen to him.         .....

6.So many people wanted to go on the trip that we had to hire another bus.                        number

We had to hire .. another bus because of a large number of people......

7. Jane is so confident that she makes friend easily. got                                                      

Jane makes friend easily because ...she got so confident..........

8.What do you intend to do with all that money?                  are                               What......are you going to do with all that money.......................................................................?

9. He drives so dangerously that it frightens me.                   such                                       

He ....is such a dangerous driver that it frightens me.............

10. Hardly anyone attended the meeting so we went home.             few                                         

There were ....so few people attended the meeting that we went home.................

 

VIII. Điền giới từ hoặc trạng từ vào chỗ trống     

1. He hasn't got ..into. that bad heart attack completely.

2. You are very late. Now we'll have to work hard to make up .for... lost time.

3. The meeting has been  put ..off... until next week.

4. Please come in. Take ..off... your coat and make yourself comfortable.

5. She resembles her mother both..in.. look and character.

6. I can't say ....with. certainty when he'll back.

7. They decide to put the house .on.. sale.

8. Her teaching style is similar.to... that of most other teachers.

9. We gained independence ...of. the French in 1945.

10. Modern farming methods can have an adverse effect ...on... the environment.

22 tháng 7 2021

5 such.. pianist