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30 tháng 12 2025

(3\(x\) + 5) ⋮ (\(x\) - 1) (đk: 1 ≠ \(x\); \(x\) \(\in\) Z)

[3\(x\) - 3 + 8] ⋮ (\(x\) - 1)

[3(\(x-1\)) + 8] ⋮ (\(x\) - 1)

8 ⋮ (\(x\) - 1)

(\(x-1\)) ∈ Ư(8) = {-8; -4; -2; -1; 1; 2; 4; 8}

Lập bảng ta có:

\(x\)-1

-8

-4

-2

-1

1

2

4

8

\(x\)

-7

-3

-1

0

2

3

5

9

1≠\(x\)

\(x\)∈Z

tm

tm

tm

tm

tm

tm

tm

tm

Theo bảng trên ta có \(x\in\) {-7; -3; -1; 0; 2; 3; 5; 9}

Vậy \(x\in\) {-7; -3; -1; 0; 2; 3; 5; 9}

30 tháng 12 2025

A = \(\frac{n+1}{2n+3}\); Chứng minh A là phân số tối giản.

Gọi ƯCLN(n + 1; 2n + 3) = d

Khi đó: (n + 1) ⋮ d và (2n+ 3) ⋮ d

(2n+ 2) ⋮ d và (2n + 3) ⋮ d

[2n + 3 - 2n - 2] ⋮ d

[(2n - 2n) + (3 -2)] ⋮ d

[0 + 1] ⋮ d

1 ⋮ d

ƯCLN(n + 1; 2n+ 3) = 1 hay

A là phân số tối giản (đpcm)

29 tháng 12 2025

`(x-1)^2=(-5)^2`

TH1:`x-1=-5`

`=> x=-5+1`

`=> x=-4`

TH2:`x-1=5`

`=> x=5+1`

`=> x=6`

29 tháng 12 2025

Đức(67)

30 tháng 12 2025

Giải:

A = 1 - 2 + 3 - 4 + ...+ 2023 - 2024 + 2025

Xét dãy số: 1; 2; 3;...; 2024; 2025

Dãy số trên có 2025 số hạng vậy A có 2025 hạng tử

Vì 2025 : 2 = 1012 dư 1 nên nhóm hai hạng tử liên tiếp của A vào nhau thì A là tổng của 1012 nhóm và 2025

A = (1 - 2) + (3 - 4) + ... + (2023 - 2024) + 2025

A = - 1 + (-1) + ... + (-1) + 2025

A = (-1) x 1012 + 2025

A = - 1012 + 2025

A = 1013

29 tháng 12 2025

1

29 tháng 12 2025

B nha

29 tháng 12 2025

Đáp án A nhé

31 tháng 12 2025

Là bệnh đóng dấu mỡ lợn

6 tháng 1

tụ huyết trùng ở gà là gì vậy


29 tháng 12 2025

1 Idea

2 idea

3 great

29 tháng 12 2025

mn giúp mình với ạ ☺

C. READINGAct 1:Vietnamese people may (21) ______ to drink at coffee shops or pubs on weekdays (22) ______ their friends after work. Some of them invite their friends to drink at their homes on weekends. In the past, the Vietnamese usually (23) ______ home-made alcohol such as "ruou gao" or "ruou de". Then, they started to drink beer or imported wines.Vietnamese people know about the damage of drinking alcohol, but they still drink. More Vietnamese people (24) ______ their free time outside...
Đọc tiếp

C. READING

Act 1:

Vietnamese people may (21) ______ to drink at coffee shops or pubs on weekdays (22) ______ their friends after work. Some of them invite their friends to drink at their homes on weekends. In the past, the Vietnamese usually (23) ______ home-made alcohol such as "ruou gao" or "ruou de". Then, they started to drink beer or imported wines.

Vietnamese people know about the damage of drinking alcohol, but they still drink. More Vietnamese people (24) ______ their free time outside their homes such as cinemas, theatres or coffee shops. The number of places for entertainment has increased in big cities. However, more young people use their free time to study or attend clubs or centres for improving (25) ______ such as communications, presentation and team working.

Q21: A. go  B. go out  C. go on  D. go away

Q22: A. for  B. of  C. with  D. to

Q23: A. drink  B. drinking  C. to drink  D. drank

Q24: A. spend  B. take  C. come  D. waste

Q25: A. knowledge  B. skills  C. experience  D. memory

Act 2:

The Power of Music 🎵
Music is a powerful form of art that affects people in many ways. It's a universal language because everyone, regardless of where they come from, can enjoy it.

There are many different kinds of music. Classical music, like the works of Beethoven, is often complex and great for calming the mind. Pop music is popular with young people because it's catchy and easy to dance to. Folk music tells stories about a country's history and culture.

Listening to music is more than just entertainment. Studies show that music can reduce stress and improve your mood. For students, soft instrumental music can even help them concentrate while studying. Also, learning to play a musical instrument, such as the guitar or the piano, teaches you discipline and creativity. It is truly an important part of human life.

Q31: What is the passage mainly about?
A. The life of Beethoven.
B. How to play musical instruments.
C. The importance and different kinds of music.
D. The history of pop music.

Q32: The word "universal" in paragraph 1 is CLOSEST in meaning to:
A. local  B. global  C. difficult  D. unique

Q33: Which of the following is TRUE, according to the pasage

A. Music can affect people's emotions in many ways.
B. Pop music is the only kind of music that reduces stress.
C. Classical music is only suitable for the elderly.
D. Folk music helps students concentrate better in studies.

Câu 34: According to the passage, what is a benefit of listening to music?
A. It makes you an excellent singer.
B. It helps you travel around the world.
C. It can reduce stress and improve your mood.
D. It helps you avoid doing homework.

Câu 35: The word "calming" in paragraph 2 is OPPOSITE in meaning to:
A. relaxing  B. exciting  C. comfortable  D. quiet

3
29 tháng 12 2025

Dưới đây là các đáp án cho phần Reading bạn gửi:

Act 1:
Q21: B. go out – "may go out to drink" là đúng ngữ pháp và nghĩa.
Q22: C. with – uống cùng bạn: "with their friends".
Q23: D. drank – thì quá khứ: "In the past, the Vietnamese usually drank home-made alcohol…".
Q24: A. spend – "spend their free time" là cách diễn đạt chuẩn.
Q25: B. skills – "improving skills such as communication, presentation and team working."

Act 2:
Q31: C. The importance and different kinds of music – nội dung chính là vai trò và các loại âm nhạc.
Q32: B. global – universal = toàn cầu, phổ quát.
Q33: A. Music can affect people's emotions in many ways. – đúng với thông tin trong đoạn.
Q34: C. It can reduce stress and improve your mood. – đúng theo nội dung bài.
Q35: B. exciting – "calming" nghĩa là làm dịu, trái nghĩa là "exciting".

Nếu muốn, mình có thể giải thích chi tiết tại sao từng đáp án đúng để bạn học nhanh hơn. Bạn có muốn mình làm không?

29 tháng 12 2025

C. READING Act 1:

Vietnamese people may (21) ______ to drink at coffee shops or pubs on weekdays (22) ______ their friends after work. Some of them invite their friends to drink at their homes on weekends. In the past, the Vietnamese usually (23) ______ home-made alcohol such as "ruou gao" or "ruou de". Then, they started to drink beer or imported wines.

Vietnamese people know about the damage of drinking alcohol, but they still drink. More Vietnamese people (24) ______ their free time outside their homes such as cinemas, theatres or coffee shops. The number of places for entertainment has increased in big cities. However, more young people use their free time to study or attend clubs or centres for improving (25) ______ such as communications, presentation and team working.

Q21: A. go  B. go out  C. go on  D. go away

Q22: A. for  B. of  C. with  D. to

Q23: A. drink  B. drinking  C. to drink  D. drank

Q24: A. spend  B. take  C. come  D. waste

Q25: A. knowledge  B. skills  C. experience  D. memory

29 tháng 12 2025

4 + 5 - 6.8 : 6

= (4+ 5) - (6 : 6).8

= 9 - 1 .8

= 9 - 8

= 1

Sai r bằng 5

D. WRITINGAct 1:Q31: a. Rose: I’ll see you there at around 7 pm.b. Rose: Are you coming to the party at Sarah’s house tonight?c. Lisa: Yes, I wouldn’t miss it! I’ve heard it’s going to be a lot of fun.A. b–c–a  B. a–b–c  C. c–b–a  D. b–a–cQ32: a. Jack: Have you seen the new restaurant downtown?b. John: It’s delicious. You should definitely try it sometime.c. Jack: How’s the food?d. John: Yes, I’ve been there twice already!A. a–d–c–b  B....
Đọc tiếp

D. WRITING

Act 1:

Q31:
a. Rose: I’ll see you there at around 7 pm.
b. Rose: Are you coming to the party at Sarah’s house tonight?
c. Lisa: Yes, I wouldn’t miss it! I’ve heard it’s going to be a lot of fun.
A. b–c–a  B. a–b–c  C. c–b–a  D. b–a–c

Q32:
a. Jack: Have you seen the new restaurant downtown?
b. John: It’s delicious. You should definitely try it sometime.
c. Jack: How’s the food?
d. John: Yes, I’ve been there twice already!
A. a–d–c–b  B. c–b–a–d  C. a–b–c–d  D. c–d–a–b

Q33:
a. Lan: What did you do last weekend?
b. Lan: That sounds nice! Did you have fun?
c. Mai: I visited my grandparents and helped them in the garden.
A. a–b–c  B. c–b–a  C. a–c–b  D. b–c–a

Q34:
a. David: You should stop using your phone before bed and try reading a book.
b. Mai: That’s a good idea! I’ll start turning off my phone at 10 p.m.
c. Mai: I usually stay up until midnight playing games, so I’m always sleepy in the morning.
d. David: You look really sleepy, Mai. Are you getting enough sleep?
A. a–b–d–c  B. d–a–c–b  C. c–d–a–b  D. d–c–a–b

Act 2:

Q33: My bag is not like hers.
A. My bag is similar to hers.
B. My bag is different from hers.
C. My bag is the same to hers.
D. My bag is like as hers.

Q34: When do you usually go to bed?
A. What time do you usually go to bed?
B. What time you usually go to bed?
C. What do you usually go to bed time?
D. What are you usually go to bed time?

Q35: When do you usually do your homework?
A. What time do you usually do your homework?
B. What time you usually do your homework?
C. What do you usually do your homework time?
D. When are you usually do your homework?

Q36: Their car is not the same as ours.
A. Their car is similar to ours.
B. Their car is different from ours.
C. Their car is the same to ours.
D. Their car is like as ours

Act 3:

Q37: She went to the park. She went there yesterday.
A. She goes to the park yesterday.
B. She went to the park yesterday.
C. She was going to the park yesterday.
D. She goes to the park every day.

Q38: Drinking too much soda is not healthy. You shouldn't do it.
A. You shouldn’t drink too much soda because it is unhealthy.
B. You should drink too much soda because it is unhealthy.
C. Drinking too much soda is healthy, so you shouldn’t do it.
D. You must drink soda because it is unhealthy.

Q39: He finished his homework. He did it last night.
A. He finishes his homework last night.
B. He finished his homework last night.
C. He was finishing his homework last night.
D. He finish his homework every night.

Q40: Watching TV for too long is bad for your eyes. You shouldn't do it.
A. You shouldn’t watch TV for too long because it is bad for your eyes.
B. You should watch TV for too long because it is bad for your eyes.
C. Watching TV for too long is good for your eyes, so you shouldn’t do it.
D. You must watch TV because it is bad for your eyes.

7
29 tháng 12 2025

Bạn tick cho mình nhé!


Act 1: Sắp xếp hội thoại

Q31:

  • Bắt đầu câu chuyện: hỏi có đi dự tiệc không → b
  • Trả lời: có, nghe nói sẽ vui → c
  • Sau đó: hẹn gặp → a

✅ Đáp án: A. b–c–a

Q32:

  • Jack hỏi: “Have you seen the new restaurant?” → a
  • John trả lời: “Yes, I’ve been there twice already!” → d
  • Jack hỏi tiếp: “How’s the food?” → c
  • John nhận xét: “It’s delicious…” → b

✅ Đáp án: A. a–d–c–b

Q33:

  • Lan hỏi: “What did you do last weekend?” → a
  • Mai trả lời: “I visited my grandparents…” → c
  • Lan phản hồi: “That sounds nice!…” → b

✅ Đáp án: C. a–c–b

Q34:

  • Mai thừa nhận ngủ muộn → c
  • David nhận xét: “You look sleepy…” → d
  • David khuyên → a
  • Mai đồng ý → b

✅ Đáp án: D. d–c–a–b


Act 2: Chọn câu đồng nghĩa / hỏi

Q33: My bag is not like hers.

  • Nghĩa: khác → B. My bag is different from hers. ✅

Q34: When do you usually go to bed?

  • Câu hỏi đúng ngữ pháp → A. What time do you usually go to bed? ✅

Q35: When do you usually do your homework?

  • Câu hỏi đúng ngữ pháp → A. What time do you usually do your homework? ✅

Q36: Their car is not the same as ours.

  • Nghĩa: khác → B. Their car is different from ours. ✅

Act 3: Viết lại câu / nối câu

Q37: She went to the park. She went there yesterday.
✅ B. She went to the park yesterday.

Q38: Drinking too much soda is not healthy. You shouldn't do it.
✅ A. You shouldn’t drink too much soda because it is unhealthy.

Q39: He finished his homework. He did it last night.
✅ B. He finished his homework last night.

Q40: Watching TV for too long is bad for your eyes. You shouldn't do it.
✅ A. You shouldn’t watch TV for too long because it is bad for your eyes.

29 tháng 12 2025

Dài thế.Đề cương à