\(\frac{1}{\cos^2\left(x\right)}-\tan^2x-\sin^2x\)

hãy xét tính đồng biến, nghịch biến của hàm số:

a) \(y=\frac{x}{x+1}\) trên\(\left(-\infty;1\right)\)và\(\left(-1;\infty\right)\)

b) \(y=\frac{2x+3}{-x+2}\) trên\(_{\left(-\infty;2\right)}\)và\(\left(2;+\infty\right)\)

c) \(y=x^2+2x+1\) trên\(\left(-\infty;-1\right)\)và\(\left(-1;\infty\right)\)

d) \(y=-x^2+2x+5\) trên\(\left(-\infty;1\right)\) và\(\left(1;+\infty\right)\)

CÁC BẠN TÌM GIÚP MK LỖI SAI VÀ SỬA LẠI GIÚP MK NHA

82. When he still worked for Oxfam, he was coming up with different ideas to help needy people.
83. The volunteers went to a nearby school on a Sunday morning, picked up a food package, and delivered them to an elderly person.

84. The lives of disadvantaged students are often very different for those of their more wealthy peers.
85. There are lots of amused ways to volunteer in the arts such as teaching, designing and assisting with a variety of arts and crafts.
86. Mahatma Gandhi fought against the rights of poor people and women in India and became a hero for millions of people.
87. In her lifetime, Audrey Hepburn also paid a visit to Viet Nam to bring awareness of immunisation and sets up clean water programmes.
88. While he and his wile Ali first went to Africa, they worked in a refugee camp for a month.
89. The famous Irish rock band U2 wrote the song Walk On to honour this amazed woman, who put her country before everything.
90. He worked in a big bank in London when suddenly he decided to leave this city to take part in Volunteer Bolivia.

1.Cho tam giác ABC đều cạnh , có AH là đường trung tuyến.Tính \(\overrightarrow{AC}\)+\(\overrightarrow{AH}\)

2.Cho hình chữ nhật ABCD tâm O gọi M; N lần lượt là trung điểm OA và CD biết MN = a.AB +b. AB .Tính a + b

3. Cho hình bình hành ABCD có N là trung điểm của AB và G là trọng tâm của tam giác ABC. Phân tích vectơ GA theo vectơ BD và vectơ NC

4.Cho tam giác ABC . Gọi M là điểm xác định :\(\overrightarrow{4BM}\)-\(\overrightarrow{3BC}\)=\(\overrightarrow{0}\) .Khi đó \(\overrightarrow{AM}\) =?

5. CHo tam giác đều ABC canh 2a, trong tâm G. TÍNH độ dài \(\overrightarrow{AB}-\overrightarrow{GC}\)

listening to loud music at rock concert causes hearing loss in some

1.Give the correct form of the verbs in brackets:

1. They let us ( use ) ........................ this room for our study

2. I decided ( do ) ...................... a hotel management course in 2012

3. Their clients agree ( pay ) ................... by check

4. Recently, her husband has made her ( stay ) ...................... at home.

5. The course help me ( understand ) .............................. my cat better.

6. Their family didn’t want ( move ) ...................... to Scotland last year.

7. Taking part in many contests has taught me ( perform ) ............................ more confidently.

8. He was made ( hand ) ................... over all of his property.

9. Have you ever hoped ( see ) .................. your idol in real life.

10. I chose ( not participate ) ........................... in that competition.

2.Find and correct the mistakes in the following sentences:

1. Her faimily and friends advised her concentrate on study.

2. Teachers can still be creative and let their students to decide how they learn.

3. They want her consider their advice before she made up her mind

4. Parents should try make their home stimulating

5. He told me take a seat while he dealt with some other customers.

3.Give the correct form of the words in brackets:

1. He looks ................... on stage ( passion )

2. This is one of the most ............... entertainment formats in the UK. It attracts a significantly huge number of audience ( success )

3. The ................. have to get over that challange to win in this contest. ( contest )

4. Is Vietnam Idol an .................... program or a franchised one ? ( origin )

5. Van Cao is known as one of the most important ............... of modern Vietnamese music ( compose )

6.His song, Tien Quan Ca , ia the..........anthem of the socialist republic of Vietnam (nation)

7.After his................, he recieved the Ho Chi Minh prize.(die)

8.Exercising regularly is a powerful weapon to enhance.................well-being .(psychology)

9.His important...................is to invent the instrumental ballade. (achieve)

10.The male singer will sing their challenge phrase with a....melody, like musical ping pong. (differ)

GIÚP MK VS!!

1.Give the correct form of the verbs in brackets:
1. They let us ( use ) ........................ this room for our study
2. I decided ( do ) ...................... a hotel management course in 2012
3. Their clients agree ( pay ) ................... by check
4. Recently, her husband has made her ( stay ) ...................... at home.
5. The course help me ( understand ) .............................. my cat better.
6. Their family didn’t want ( move ) ...................... to Scotland last year.
7. Taking part in many contests has taught me ( perform ) ............................ more confidently.
8. He was made ( hand ) ................... over all of his property.
9. Have you ever hoped ( see ) .................. your idol in real life.
10. I chose ( not participate ) ........................... in that competition.

2.Find and correct the mistakes in the following sentences:
1. Her faimily and friends advised her concentrate on study.
2. Teachers can still be creative and let their students to decide how they learn.
3. They want her consider their advice before she made up her mind
4. Parents should try make their home stimulating
5. He told me take a seat while he dealt with some other customers.

3.Give the correct form of the words in brackets:
1. He looks ................... on stage ( passion )
2. This is one of the most ............... entertainment formats in the UK. It attracts a significantly huge number of audience ( success )
3. The ................. have to get over that challange to win in this contest. ( contest )
4. Is Vietnam Idol an .................... program or a franchised one ? ( origin )
5. Van Cao is known as one of the most important ............... of modern Vietnamese music ( compose )

6.His song, Tien Quan Ca , ia the..........anthem of the socialist republic of Vietnam (nation)

7.After his................, he recieved the Ho Chi Minh prize.(die)

8.Exercising regularly is a powerful weapon to enhance.................well-being .(psychology)

9.His important...................is to invent the instrumental ballade. (achieve)

10.The male singer will sing their challenge phrase with a....melody, like musical ping pong.(differ)

GIUPS MK VS!!!

1As soon as I did all my homework, iI went out with my friends

-> No sooner..............

2.I started studying english 3 years ago

->I...

3.The last time I saw him was 3 months ago

->I

4.We have been living here for 10 years now

->We moved......

5.His boss phoned him right after he left his office

->Harly.....

6.I din't study english until I was at grade 3

->It was not........

7.I din't realize that I had left my books at school until I came home

->Not until................

8.I last heard from him 3 years ago

-> It's..............

9.I haven't phoned Lan for 2 months

-> I last.............

10.i will say good bye to everyone, and then, I will leave for London

->Before.........

I. Hoàn thành các câu sau:


1. A: “There's someone at the door.”
B: “I _________________________ (get) it.”
2. Joan thinks the Conservatives ________________________ (win) the next election.
3. A: “I’m moving house tomorrow.”
B: “I _________________________ (come) and help you.”
4. If she passes the exam, she _________________________ (be) very happy.
5. I _________________________ (be) there at four o'clock, I promise.
6. A: “I’m cold.”
B: “I _________________________ (turn) on the fire.”
7. A: “She's late.”
B: “Don't worry she _________________________ (come).”
8. The meeting _________________________ (take) place at 6 p.m.
9. If you eat all of that cake, you _________________________ (feel) sick
10. They _________________________ (be) at home at 10 o'clock.
11. I'm afraid I _________________________ (not / be) able to come tomorrow.
12. Because of the train strike, the meeting _____________(not / take) place at 9 o'clock.
13. A: “Go and tidy your room.”
B: “I _________________________ (not / do) it!”
14. If it rains, we _________________________ (not / go) to the beach.
15. In my opinion, she _________________________ (not / pass) the exam.
16. A: “I'm driving to the party, would you like a lift?”
B: “Okay, I _________________________ (not / take) the bus, I'll come with you.”
17. He _________________________ (not / buy) the car, if he can't afford it.
18. I've tried everything, but he _________________________ (not / eat).
19. According to the weather forecast, it ____________________ (not / snow) tomorrow.
20. A: “I'm really hungry.”
B: “In that case we _________________________ (not / wait) for John.”
21. ____________________ (they / come) tomorrow?
22. When ____________________ (you / get) back?
23. If you lose your job, what ____________________ (you / do)?
24. In your opinion, ____________________ (she / be) a good teacher?
25. What time ____________________ (the sun / set) today?
26. ____________________ (she / get) the job, do you think?
27. ____________________ (David / be) at home this evening?
28. What ____________________ (the weather / be) like tomorrow?
29. There’s someone at the door, ____________________ (you / get) it?
30. How ____________________ (he / get) here