Ta có: \(\left|x-5\right|\ge0\forall x\)

\(\Leftrightarrow\left|x-5\right|+12\ge12\)

\(\Leftrightarrow\frac{14}{\left|x-5\right|+12}\le\frac{7}{6}\)

\(\Leftrightarrow B\le3+\frac{7}{6}=\frac{25}{6}\)

Vậy \(MaxB=\frac{25}{6}\Leftrightarrow x=5\)

Ta có : \(\left|x-5\right|+12\ge12\)

\(\Rightarrow\frac{14}{\left|x-5\right|+12}\le\frac{14}{12}=\frac{7}{6}\)

\(\Rightarrow B=3+\frac{14}{\left|x-5\right|+12}\le3+\frac{7}{6}=\frac{25}{6}\)

Dấu ''='' xảy ra khi x = 5

Vậy GTLN của B bằng 25/6 tại x = 5

1.It's said that Christopher Columbus discovered America.

 Christopher Columbus is said………to have discovered America…………………….

2.It is said that many people are homeless because of the flood

many people……are said to be homeless because of the flood…………………………………………….

3.It is known that the Prime Minister is in favor of the new law.

The Prime Minister……is known to be in favor of the new law………………………………………

4.It is expected that the US President will lose the election.

The US President …is expected to lose the election…………………………………………

 5. It is believed that the thieves got in through the kitchen window .

The thieves ……are believed to have got in through the kitchen window……………………………………………………

6. It is found that she drove through the town at 50 miles an hour.

She ……is found to have driven through the town at 50 miles an hour………………………………………………………..

7. It is reported that two people were seriously injured in the accident.

 Tow people…are reported to have been seriously injured in the accident………………………………………………………..

8. It is said that three men were arrested after the explosion

Three men……are said to have been arrested after the explosion…………………………………………….

9.It is thought that the prisoner escaped by climbing over the wall

The prisoner……is thought to have escaped by climbing over the wall………………………………………………….

10.It is believed that the wanted mam is living in New York

The wanted man…is believed to be living in New York………………………………………..

57. He is believed to have driven through the town at 90 km an hour.

58. Two people is reported to have been seriously injured in the accident.

5. Three men is said to have been arrested after the explosion.

6. The stricke is expected to be begin tomorrow.

7. He is said to speak English very well.

IV. Give the correct form of the verbs in the brackets to complete the sentences.

1. had lived

2. to concentrate

3. was claimed

4. earned

5. travelling.

V. Choose the word from the box to complete the following paragraph

1. hard

2. share

3. many

4. single

5. modern

VI. 

1. B

2. A

3. A

4. D

IV

1 had lived

2 to concentrate

3 is claimed

4 earned

5 travelling

V

1 hard

2 share

3 many

4 single

5 modern

VI

1 B

2 C

3 A

4 D

Gọi 2 số tự nhiên cần tìm là a và b

Vì ước chung lớn nhất là 36 suy ra a chia hết cho 36

                                                        b chia hết chô 36

suy ra a=36k

           b=36r

Mà a+b=132

suy ra 36k+36r=132

         36(k+r)=132

              k+r=132:36=3,666666...

hình như đề bài sai bạn ạ

Xin lỗi nhé, đề bài đúng tồng là 432 .

Mình ghi nhầm tổng thành tồng , mong các bạn thông cảm .

1.People say that he is 108 years old.

He is said………to be 108 years old……………………..

2.People think that he is very clever.

He is thought…to be very clever………………………

3.People believe that the wanted man is living in New York.

The wanted man……is believed to be living in New York………………………………………

4.people know that hi is very rich.

He ……is known to be very rich………………………..

5.Peole suppose that the film is very good

The film……is supposed to be very good…………………………….

6.People think that many people were killed in the accident

Many people……are thought to have been killed in the accident………………………………………….

7.People think that about a million puppies are born each year.

About a million puppies……are thought to be born each year……………………………….

8.People say that the factories are much worse.

The factories…are said to be much worse……………………………..

9.People say that those dogs are dangerous

These dogs…are said to be dangerous……………………………..

1. The building is reported to have been damaged by the fire.

2. The company is said to be losing a lot of money. (lose money: mất tiền)

3. The company is expected to lose a lot of money this year.

4. The strike is expected to end soon

 Gọi x ﴾km﴿ là độ dài quãng đường AB, y ﴾giờ﴿ là thời gian dự định đi đến B lúc đầu. (Điều kiện x > 0, y > 1)
Thời gian đi từ A đến B với vận tốc 35km là: x/35 = y + 2 => x = 35.(y + 2)
Thời gian đi từ A và B với vận tốc 50km là : x/50 = y ‐ 1 => x = 50.(y - 1)
Ta có hệ phương trình:
35.(y + 2) = 50.( y - 1)
=> 35y + 70 = 50y - 50
=> y = 8
=> x =35.( y + 2) = 35.10 = 350 (km)
Vậy quãng đường AB là 350km.
Thời gian dự định đi lúc đầu là 8h

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ok bạn nhé!!!