cho tam giác vuông ABC, góc A=90°, cạnh BC=17cm, góc B=35°.

tính cạnh AC,AB và góc C

Nguyên tắc để làm tăng giảm áp suất là ?

Ví dụ?

Tìm hiểu về những nét tương đồng và khác biệt của các quốc gia Đông Nam Á:

+Vị trí địa lí 

+Hình dạng lãnh thổ 

1+1=?

2,cho m g NaOH phản ứng hết với 400g CuSO4 20% thu đc Cu(OH)2

a,Tính m

b,Tính a

cho 6,5g Zn tác dụng hết với 400g dd CuSO4 C% thu đc m g kim loại.

a,Xác định m

b,tính C% dung dịch

Giải thích câu ca dao bầu ơi thương lấy bí cùng tuy rằng khác giống nhưng chung một giàn, muốn làm bài văn giải thích trên em cần làm mấy bước đó là bước nào nói rõ cách 1 và 2

Cho hàm số y = ax2

a, Tìm a biết đồ thị hàm số đi qua điểm A(1;3)

b, Tìm a biết đồ thị hàm số cắt đường thẳng y = 2x-2 tại điểm có hoành độ bằng 2

c, Với a tìm được ở câu b, vẽ đồ thị hàm số y = ax2 và y = 2x-2 trên cùng mặt phẳng tọa độ

d, Tìm tọa độ giao điểm của hai đồ thị vừa vẽ ở câu c

Cho hàm số y = (1/3)x2

a, Vẽ đồ thị hàm số trên

A 1927 FIFA commission examined the possibility and on the eve of the following year's Amsterdam Olympics, FIFA's Congress voted __________ (36) an inaugural world championship in 1930. The only remaining question was where. Italy, Netherlands, Spain, Sweden and Uruguay all expressed __________ (37) interest but the Uruguayans alone were prepared to pay all travel and hotel expenses as well as build a new stadium at a time of economic uncertainty. Add the fact Uruguay would be __________ (38) its centenary that same year and FIFA duly plumped for the South Americans, confirming their decision at the 1929 Congress in Barcelona.

Finding the teams to take part __________ (39) the next challenge. Seven signed up from the home continent along with Mexico and the United States. But two months before the start, there was still no European entrant. The prospect of two months away was an obvious deterrent for players with jobs at home but France and Belgium – the only two FIFA founder members to participate – eventually __________ (40) to undertake the long journey together with Yugoslavia and Romania.

Question 36: A. stage B. to stage C. staging D. have staged

Question 37: A. an B. a C. the D. x

Question 38. A. celebrating B. hosting C. defeating D. winning

Question 39. A. is B. be C. was D. will be

Question 40: A. conveyed B. made C. attracted D. agreed

The King of Football" better known as Pele was born in Edson Arantes Do Naselmento on October 23,1940 in Tres Coracoes Brazil. Son of "Dondinho" and Celeste Arantes, Pele's family was very poor. He grew up in poverty making Soccer not only an escape but a mind easier. His Father was a football player (Soccer) that later became Pele's mentor and trainer. Pele's natural talent showed off and at age 15 his career began in Santos. At age 16 he was recruited to play with Brazil's National Team. There just being the very first step in becoming one of the Best players to date. Pele won three FIFA World Cups in 1958 in Sweden, 1962 in Chile, and 1970 in Mexico. He retired in 1977 having 1281 goals and playing 1363 games. He is still known as the best player who has lead Brazil to three consecutive Championships. Also known as a humanitarian voicing his voice about the poverty issues in Brazil. Also encouraging many kids around the world that they can be great and make history no matter where you come from, your race, and who you are.

Question 31: When was Pele born?

A. in 1940 B. in 1962 C. in 1970 D. in 1977

Question 32: Was he born of a well-being family?

A. Yes, he was B. No, he wasn’t

Question 33: Who was Pele’s mentor and trainer?

A. his teacher B. his coach C. his brother D. his father

Question 34: How old was he when he was recruited to play with Brazil's National Team?

A. 13 B. 14 C. 15 D. 16

Question 35 : How many goals had he scored before he retired?

A. 1281 B. 1362 C. 1977 C. 1940

Question 28 : _______ examinations always make him nervous.

A. an B. a C. the D. θ

Question 29 : The children were __________ by Walt Disney films.

A. fascinating B. fascinated C. fascination D. fascinate

Question 30: The baby was ________ of being left alone in the room.

A. terrible B. terrified C. terrific D. terrifying

Question 26 : What ________ wear for tonight’s party?

A. will you B. will you be going to

C. are you D. are you going to

Question 27 : The coach ________ announce the list of footballers at the meeting tomorrow morning. He’s

got the final list.

Question 23 : ______ breakfast is ______ first meal of the day.

A. The/ the B. A/ ø C. The/ ø D. ø/ the

Question 24 : The Beatles used to be internationally famous ______ their songs and performance.

A. for B. along C. with D. a

Question 25 : Don’t let the children see _______ films.

A. horror B. horrifying C. horrified D. horrible

Question 20 : The sports ____________ lasted for 2 weeks in London.

A. compete B. competition C. competing D. competitive

Question 21 : Playing sports is _________ good way to stay away from stress.

A. a B. an C. the D. x

Question 22 : __________ is a running race of over 26 miles.

Câu 2: tìm các giới hạn sau:

C. $\underset{x\to 2}{\lim }\frac{5x-3}{x-2}$

D. $\underset{x\to 1}{lim} \frac{\sqrt{3x+1}-2x}{1-\sqrt{x}}$

Question 17 : The host nation was Uruguay and it __________ Argentina in the final.

A. awarded B. defeated C. achieved D. witnessed

Question 18 : Up to now, the world has witnessed twenty-one World Cup_________.

A. tournaments B. games C. events D. audiences

Question 19 : Annie love doing sports. She’s ___________.

A. hungry B. happy C. funny D. sporty

Question 14 : The _________ game of the 1994 tournament was played to a television audience of more

than 1 million viewers.

A. final B. friendly C. joint D. popular

Question 15 : These are all-star, professional teams __________ of 22 players each.

A. consisted B. composed C. included D. contained

Question 16 : Do you know which country __________ the 2022 World cup?

Question 11: The Red Bull team is considered as __________ finalist of the two teams.

A. the strongest B. stronger C. the stronger D. strongest than

Question 12 : If our team defeat Banana team, we ________ the trophy.

A. will award B. are awarded C. to award D. will be awarded

Question 13 : Where will the World cup 2020___________?

A. be held B. held C. hold D. be hold

Question 8: The team who comes second only to another team in a competition is the ________.

A. runner-up B. world cup C. tournament D. champion

Question 9: My village ___________ part in the sporting event soon.

A. will takes B. is going to take C. taking D. takes

Question 10: This championship attracts millions ___________ participants all over the world.

A. in B. on C. of D. to

Question 5 : A midfielder is a member of a soccer team active in the corner of the playing field,

. often both offensively and defensively

A. a member B. in C. offensively D. defensively

Question 6: A fan is someone who admires and supports a person team sports, etc.

A. a B. someone C. admires D. team sports

Question 7: In football, a small yellow card is shown to a player by the referee as a warning that

the player not obeyed a rule.

9. A: Did you post that letter for me?

B: Oh. I'm sorry. I completely forgot. ............................ it now (I/do)

10. A: The ceiling in this room doesn't look very safe, does it?

7. A: I don't know how to use this camera.

B: It's easy. ............................... you (I/show)

8. A: What would you like to eat?

B: ........................ a sandwich, please? (I/have)

5. A: I've decided to repaint this room.

B: Oh, have you? What colour ....................... it (you/paint)

6. A: Where are you doing?Are you going shopping?

3. A: I've got a headache.

B: Have you? Wait a second and ................... an aspirin for you (I/get)

4. A: Why are you filling that bucket with water?

4) Đốt cháy hoàn toàn 1.12 lít một anken X(đktc) thu được 5.60 lít khí CO2(đktc) .Tìm công thức phân tử.

Câu 2: 

$$\begin{gathered} a. \underset{x\to 3}{lim} \frac{x^2-2x-3}{x^2-9} \\ b. \underset{x\to ‐\infty }{lim} \frac{\sqrt{9x^6-2x+3}-2x^3}{3-x^3} \end{gathered}$$

Quan sát nội dung : “có thể bạn chưa biết” sgk trang 84 cho biết lượng sinh tố mất đi trong quá trình chế biến ?

The home of the future

 When you’re out of the house, is the fridge on the phone to the supermarket? Is the heating system having a word with the bath? And when you get back home, does the doorknob recognise you and say hello? Probably not, but in the house of the future all this - and more - is possible.
​Researchers say that technology will transform your home in ways you can only dream about. Nanotechnology will play an important role. It will clean your windows. Intelligent spoons will check how hot or cold your soup is and the walls will sense if anyone is in your garden.

​The next generation of fridges will use the Internet to make sure your food stays fresh and they’ll get in touch with the supermarket to order some more and you’ll never run out of milk again.

​When you are on the way home and feel like a warm bath, all you have to do is sending a text message to the heating system. The heating system warms the water and even runs the bath so that as soon as you walk through the front door, you can jump in and relax

Television is one of _________ (36) inventions of human beings. Today we can find television almost everywhere ___________ ( 37) the world. The first television was invented in 1927 by a 21 years old inventor – Philo Taylor Farnsworth. Watching television __________ (38) both recreational and informative. There are some news programs for adults _________ (39) information. There are also tutorial channels based on specific subjects for the students. ___________ (40), it’s harmful to spend too much time watching television. Some shows are too violent for the children to watch because they may imitate.

Question 36: A. greater B. the greatest C. great D. greater than

Question 37: A. of B. on C. in D. at

Question 38: A. is B. are C. be D. am

Question 39:A. to get B. getting C. get D. to be getting

Question 15: A right-winger is a person whom plays on the right side of the field in a sports game.

Trong nhưng hành trang ấy có lẽ sự chuẩn bị bản thân con người là quan trọng nhất từ cổ chí kim ..........lại càng nổi trội