#muon roi ma sao con 

\(\frac{2-x}{4}< 5x\Leftrightarrow\frac{2-x}{4}< \frac{20x}{4}\)

\(\Leftrightarrow2-x< 20x\Leftrightarrow2< 21x\Leftrightarrow x>\frac{2}{21}\)

Vậy Bất phương trình có tập nghiệm là S = { x | x > 2/21 } 

Đập chết nó luôn :)

( x+1 ).( y+2) = 3xy

=> ( x+1 ) . y + ( x+1) . 2 = 3xy

=> xy + y + 2x + 2 = 3xy

=> 2x + y + 2 = 3xy - xy

=> 2x + y + 2 = 2xy

=> 2              = 2xy - 2x - y

=> 2xy - 2x - y = 2

=> 2x . ( y-1 ) - y + 1 = 2 + 1

=> 2x . ( y-1 ) - ( y-1 ) = 3

=> ( 2x - 1 ) . ( y-1 ) = 3 = 1.3 = (-1) . (-3)

Vì x, y \(\in\)Z và 2x-1 là số lẻ nên ta có bảng sau:

Vậy cặp số nguyên ( x;y ) \(\in\){ ( 1;4 ) ; ( 2;2 ) ; ( 0;-2 ) ; ( -1;0 ) }

ừ để mk giúp

* Có gì sai sót mong ADMIN bỏ qua ạ *

Complete the directed speech sentences.

1. “Every weekend, the astronauts can have private video conferences with their families on the Earth,” Dr. Nelson said.

→ Dr. Nelson said that the astronauts could had private video-conferences with their families on the Earth.

2. “Have the astronauts ever forgotten anything from the Earth?” Nick asked his teacher.

→ Nick asked his teacher if the astronauts had ever forgotten anything from the Earth.

3. “The astronauts on the ISS use a 3-D printer on board to print certain objects,” the teacher answered Nick.

→ The teacher told Nick that the astronauts on the ISS used a 3-D printer on board to print certain objects.​

4. “Where can we look for life?” Nga asked Dr. Nelson.

→ Nga asked Dr. Nelson where they could look for life.

5. “Ganymede, the largest moon of Jupiter, has a large saltwater ocean,” the teacher said.

→ The teacher said Ganymede, the largest moon of Jupiter, has a large saltwater ocean.

Complete the directed speech sentences.

1. “Every weekend, the astronauts can have private video conferences with their families on the Earth,” Dr. Nelson said.

→ Dr. Nelson said that the astronauts could had private video-conferences with their families on the Earth.

2. “Have the astronauts ever forgotten anything from the Earth?” Nick asked his teacher.

→ Nick asked his teacher if the astronauts had ever forgotten anything from the Earth.

3. “The astronauts on the ISS use a 3-D printer on board to print certain objects,” the teacher answered Nick.

→ The teacher told Nick that the astronauts on the ISS used a 3-D printer on board to print certain objects.​

4. “Where can we look for life?” Nga asked Dr. Nelson.

→ Nga asked Dr. Nelson where they could look for life.

5. “Ganymede, the largest moon of Jupiter, has a large saltwater ocean,” the teacher said.

→ The teacher said Ganymede, the largest moon of Jupiter, has a large saltwater ocean.

Em cảm ơn ạ

1- She said: "Did the mechanics finish repairing your car?"

- She asked me if the mechanics had finished repairing my car.

2- I asked my friend: "Was anyone hurt in the car accident last month?"

- I asked my friends if any one had been hurt in the car accident the month before.

3- She said: "Why has David been looking so miserable lately?"

- She asked me why David had been looking so miserable lately

4- She asked me: "How old are you now?"

- She asked me how old I am.

5- He said to her: "Have you been to town today?"

- She asked her if she had been to town that day.

6- John said: "How long does it take you to get to London, Mary?"

- John asked Mary how long it took her to get to London.

7- The policeman asked the little girl: "What's your name?"

- The policeman asked the little girl what her name

8- Mr.Green said to his secretary: "Who did you talk to a few minutes ago?"

- Mr.Green said to his secretary who she had talked to a few minutes before.

9- Paul said: "Can you swim, Mary?"

- Paul asked Mary if she could swim

1. He said to her: “Have you been to town today ?”

→ She asked her if she had been to town that day

2. John said: “How long does it take you to get to London, Mary?”

→ John asked Mary how long it took she to get to London

3. The policeman asked the little girl: “What‟s your name?”

→ The policeman asked the little girl what her name was

4. Mr. Green said to his secretary: “Who did you talk to a few minutes ago?”

→ Mr. Green asked his secretary who she had told to a few minutes before

5. Paul said: “Can you swim, Mary?”

→ Paul asked Mary if she could swim

6. He said: “Where can I find her in this town?”

→ He asked where he could find her in that town

7. She asked her son: “Do you know which is the cup you used ?”

→ She asked her son which was the cup he used

8. Helen said: “What did you say, Jack ?”

→ Helen asked Jack what he had said

9. She said to him: “Why didn't you get up early this morning ?”

→ She asked him to get up early that morning

10. He said: “Will it rain tonight?”

→ He asked if it would rain that night

a, \(-7x+13>-7y+13\Leftrightarrow-7x>-7y\Leftrightarrow x< y\)

b, \(11x-1>11y+1\Leftrightarrow11x+1>11y+1\Leftrightarrow x>y\)

c, \(-19x-37< -19y-37\Leftrightarrow-19x< -19y\Leftrightarrow x>y\)

d, \(-23x-2>-23y+3\Leftrightarrow-23x+3>-23y+3\Leftrightarrow x< y\)

 Trình độ viết còn kém mong Nhi thông cảm :)))

    In modern life, many young people are not aware of the gradual cultural identity of our nation as old as folk music, folklore or paintings, costumes of the past. Therefore, it is very important for young people to know folk tales. These fairy tales, jokes, stories legends that were previous generations refined over the years are the lesson elite that the next life to learn, is the emotional purity of love without resentment hatred, which are beautiful endings for honest people. Yet many young people now do not understand the story just read the manga tran without attention to ancient folklore, this is a very sad issue in adolescents.

– Sông ngòi  chảy theo hai hướng chính là Tây Bắc- Đông Nam và vòng cung.

– Sông ngòi có hai mùa nước: mùa lũ và mùa cạn.

– Sông  ngòi có  lượng phù sa lớn.

a. Nước ta có mạng lưới sông ngòi dày đặc, phân bố rộng khắp trên cả nước.

 - Nước ta có 2360 sông dài > 10km.

 - 93% các sông nhỏ và ngắn.

 - Các sông lớn: sông Hồng, sông Mê Công…

b. Sông ngòi nước ta chảy theo hai hướng chính là Tây Bắc – Đông Nam và hướng vòng cung.

 - Các con sông chảy hướng Tây Bắc – Đông Nam : sông Hồng, sông Thái Bình, sông Đà..

 - Các con sông chảy hướng vòng cung (chủ yếu ở vùng núi Đông Bắc): sông Thương, sông Lục Nam…

c. Sông ngòi nước ta có hai mùa nước: mùa lũ và mùa cạn khác nhau rõ rệt.

- Mùa lũ nước sông dâng cao và chảy mạnh. Lượng nước chiếm 70 – 80% lượng nước cả năm.

- Mùa lũ có sự khác nhau giữa các hệ thống sông.

d. Sông ngòi nước ta có hàm lượng phù sa lớn.

 - Sông ngòi vận chuyển tới 839 tỉ m3 nước hàng trăm triệu tấn phù sa.

 - Hàm lượng phù sa lớn, 200 triệu tấn/năm.