Trong tam giác vuông dưới đây, biết $BC=3\mathrm{cm}$, $AC=n$,$AD=m$, CD= 2cm. Tính giá trị của $m^2-n^2$

II/ VOCABULARY AND GRAMMAR

Choose the best option (A, B, C or D) to complete each of the following questions.

5. When you visit a new country, you __________ try to learn the language.

A. should                    B. can’t                       C. don’t                      D. enjoy

6. I love sunbathing on sandy __________.

A. mountains               B. deserts                    C. islands                    D. beaches

7. Liz: Let’s go camping this weekend!

    Sue: __________________.

A. Ok. I’ll bring a tent.                                   B. No, thanks.

C. It’s not cheap.                                            D. Some bottled water, please.

8. You _______ swim in this river. It looks dangerous, the water is deep and the currents are strong, too.

A. can not                   B. should                     C. can't                        D. may

9. I have 2 towels, _______ I don’t bring any pillows. Can I borrow yours?

A. but                          B. so                            C. for                           D. or

10. There are beautiful white sand beaches at Phú Quốc _________.

A. national park          B. mountain                C. canyon                    D. island

11. We can’t take photographs because the camera’s run out of _____________. It needs charging.

A. time                                    B. battery                    C. light                        D. pictures

12. I usually go to school _______ bus, but I'm walking today.

A. in                            B. to                            C. by                           D. with

III/ ERROR CORRECTION

Find the underlined part that needs correction in each of the following questions.

13. We really had a good time in Italy last week, and the flight was two hours late.

                   A                            B                            C                   D

14. Where do they should visit for their next vacation?

          A               B                     C    D

15. He should visits us in Bali for his summer vacation.

                          A     B              C                          D

16. There are a huge forest, pretty villages, and amazing waterfalls here.

                 A                            B                    C                                     D

IV/ WORD FORM

Write the correct form of the given words.

17. Last year, we went _______________(RAFT) on the Colorado River; it was wonderful.

18. You shouldn’t go hiking today. It’s raining hard, so it’s very _______________(DANGER).

19. There are regular _______________(FLY) to Phú Quốc island every day.

20. The Great Wall of China is one of the Seven _______________(WONDERFUL) of the World.

V/ READING

Read the passage, then match the places with the suitable information. Write H for Ha Long Bay, S for Son Doong Cave, and P for Phong Nha – Ke Bang.

Dear Megan,

I’m so happy to know that you are coming to Vietnam for your vacation. When you’re here, you should visit Hạ Long Bay. It is in the north of Vietnam and one of the UNESCO World Heritage Sites. Hạ Long Bay is special because it has over 1600 limestone islands with wonderful ocean views. You can take an overnight cruise trip or go kayaking there. Another place you shouldn’t miss visiting is Sơn Đoòng Cave – one of the most famous caves in the world. It is really big and it has its own river and a forest inside – like a fantasy world. You can also go on a trek tour around Phong Nha – Kẻ Bàng National Park. This place is home to tigers, elephants and 300 species of birds. The best time to go is from October to December, when the weather is really nice.

See you soon,

Nhung

21. You can go trekking there.                                                               ____

22. You can take a cruise trip or go kayaking there.                              ____

23. You can see hundreds of wildlife species there.                              ____

24. There is a river and a forest inside this place.                                   ____

25. It is famous for having a large number of limestone islands.           ____ ____

VI/ WRITING

A. Put the words in the correct order to make correct sentences.

26. aren’t/ We/ Turkey because/ trip to/ taking the/ the baby/ we can’t/ home/ leave/ at/.

à ___________________________________________________________________

27. five/ It/ to/ takes/ get/ Sapa/ bus/ hours/ to/ by/.

à ___________________________________________________________________

28. do/ to/ What/ bring/ we/ trip/ for/ need/ camping/ our/?

à ___________________________________________________________________

B. Rewrite the following sentences without changing their meaning. Use the given word(s) if any.

29. You need to wear sunglasses to protect your eyes from the sun.

à You need to wear sunglasses so__________________________________________

30. Having a trip to Sapa at this time of year is wonderful.

à It is ________________________________________________________________

Unit 9 | HOUSES IN THE FUTURE

I/ PRONUNCIATION

A. Choose the word whose underlined part differs from the other three in pronunciation in each of the following questions.

1. A. robots                 B. screens                    C. homes                     D. printers

2. A. machines            B. devices                   C. drones                     D. companies

B. Choose the word that differs from the other three in the position of the main stress in each of the following questions.

3. A. megacity             B. deliver                    C. technology              D. computer

4. A. astronaut                        B. gravity                    C. discuss                    D. exercise

II/ VOCABULARY AND GRAMMAR

Choose the best option (A, B, C or D) to complete each of the following questions.

5. To protect the environment, he takes _______ canvas bags instead of plastic ones.

A. eco-friendly            B. earthscraper            C. underground           D. automatic

6. Don’t forget your raincoat when you go out this afternoon, it ______________.

A. will rain                  B. must rain                 C. might rain               D. should rain

7. In 2030, __________ will deliver most things in less than half an hour.

A. smart walls             B. 3D printers             C. smart screens          D. drones

8. Do you think _______ of people will live in smart homes?

A. lots                         B. a lots                       C. lot                           D. any lot

9. Women in the future will do all the housework with the help of modern __________.

A. kitchen                   B. equipment               C. household               D. cooking

10. Now we drive petrol cars, but in 2040, all transport __________ electric.

A. was                         B. is                             C. will be                     D. have to be

11. A: How might homes change in the future?

    B: _________

A. Many people lived under the sea.                   

B. Scientist would find life on other planets.

C. We might use our mobiles to turn on everything in our homes.

D. I think life is different now from in the past.

12. What ________ life be like if we live on the moon in the 23rd century?

A. was                         B. do                           C. is                             D. will

III/ ERROR CORRECTION

Find the underlined part that needs correction in each of the following questions.

13. On a space station, astronauts sleep in their sleeping bags and tie it to the wall.

       A                                               B          C                                      D

14. Children nowadays use smart devices everywhere and rarely play to one another.

                                       A                 B                                   C             D

15. Meals in space is very different to the ones at home.

                 A           B                        C         D

16. We might shopping online and drones will deliver our food in the future.

                             A                            B                          C                D

IV/ WORD FORM

Write the correct form of the given words.

17. Life in space is really _______________(DIFFER) from life on Earth.

18. Car producers are experimenting many new __________________(TECHNOLOGICAL) to reduce exhaust fumes.

19. We should bring some _____________(DRY) food for the camping trip so we don’t need much cooking equipment.

20. A(n) ________________(FRIEND) house is a house that is good for the environment.

V/ READING

Read the following passage and fill in each blank with a suitable word or phrase from the box. There is ONE word/phrase that you don’t need.

· observe      · move   · space station       · lock      · spacesuits       · floats

A DAY IN SPACE

Life in space is not the same as life on Earth. Astronauts can live and work in the (21)_____________ for months. Every day, they get up, get dressed and have breakfast. Eating in space is interesting. Everything (22) __________  around because there is no gravity. Space food is always dried and is put in small box and bags. After breakfast, they start working. Their job is to (23) ____________  the planets or take photos. Sometimes, astronauts need to go outside the space station. They call this spacewalking. They have to wear (24) ____________  when they go for a spacewalk. After work, astronauts have to spend 2.5 hours doing exercise, so they can maintain their muscles and fitness. Finally, they go to bed. It’s difficult to sleep because astronauts can’t lie down. They have to (25) _____________  their sleeping bags to the walls.

VI/ WRITING

A. Put the words in the correct order to make correct sentences.

26. life/ I think/ everybody/ will/ much/ for/ be/ easier/ the future/ in/.

à ___________________________________________________________________

27. Vietnamese astronaut/ Phạm Tuân/ to go/ became/ to space/ the first/.

à ___________________________________________________________________

28. the cooking/ will/ An automatic/ for you/ food machine/ do/.

à ___________________________________________________________________

B. Rewrite the following sentences without changing their meaning. Use the given word(s) if any.

29. It’s possible that we will have robot pets in the future.

à We________________________________________________________________

30. Maybe people will be able to live on Mars.

à People _____________________________________________________________

Unit 10 | CITIES AROUND THE WORLD

I/ PRONUNCIATION

A. Choose the word whose underlined part differs from the other three in pronunciation in each of the following questions.

1. A. weather              B. although                 C. three                       D. that

2. A. theater                B. cathedral                 C. mother                    D. birthday

B. Choose the word that differs from the other three in the position of the main stress in each of the following questions.

3. A. expensive           B. vacation                  C. attraction                D. capital

4. A. remember           B. noisier                     C. dirtier                      D. happier

II/ VOCABULARY AND GRAMMAR

Choose the best option (A, B, C or D) to complete each of the following questions.

5. Last year, I visited Buckingham __________. Queen Elizabeth and the royal family live there sometimes.

A. Palace                     B. Tower                     C. Park                        D. Museum

6. The __________ of King Leonidas of Sparta in Greece is bigger and taller than a real man.

A. museum                  B. bridge                     C. statue                                  D. tower

7. What is ____________ populated city in Vietnam?

A. more                       B. most                        C. the most                  D. a most

8. Hồ Chí Minh city is the _______ and _______in Vietnam.

A. biggest / most crowded                              B. bigger / most crodwded

C. more bigger / more crowded                      D. most biggest / most crowded

9. Disneyland is one of the biggest __________ in the USA. It’s full of magic, roller coasters and entertainment for all ages.

A. museums                B. amusement parks    C. shopping malls        D. buildings

10. The famous palace in the center of Ho Chi Minh city is called ____________ Palace.

A. Liberty                   B. Cathedral                C. Reunification          D. Tower

11. I  __________ Camden, the most famous street market in London if I _______ time.

A. will visit/ have        B. visit/ will have        C. visit/ have               D. will visit/ should have

12. What __________ you do if the weather is not beautiful tomorrow?

A. do                           B. will                         C. are                           D. did

III/ ERROR CORRECTION

Find the underlined part that needs correction in each of the following questions.

13. I think food in Singapore is more expensive then food in Vietnam.

           A            B                   C                             D

14. If the cutting down of trees continue, there will be big floods every year.

                                                        A                   B        C                         D

15. We need a more larger room because this room is too small for 6 of us.

                               A                        B                               C                   D

16. If they will have more time, they will visit Hanoi’s beautiful landmarks.

                       A               B                      C           D

IV/ WORD FORM

Write the correct form of the given words.

17. One of the most famous tourist _________________(ATTRACT) in Đà Nẵng is the Golden Bridge in Bà Nà Hills.

18. China is the most _________________(POPULATION) country in the world with more than 1,4 billion people.

19. It’s _________________(NOISE) to live in big cities than in the countryside.

20. We should use public transportation to keep the city _________________(POLLUTE).

V/ READING

Read the passage and write short answers to the following questions.

My name is Akiko and I was born in Tokyo – the capital of Japan. The city is huge with a population of 14 million people, but it is one of the safest cities in the world. The most beautiful time of year is from March to April, when the famous cherry blossom is on the trees. If you come to Tokyo, remember to visit the Imperial Palace. Guided tours last about 75 minutes and are available daily except on Sundays and Mondays. At the moment, I’m studying in London – the capital of England. London is home to about 8.9 million people. With hundreds of castles, museums, gardens, theaters and cinemas, London is one of the most popular destinations to visit in the world. The best time to go to London is between March and May when the temperatures are pleasant and the city’s parks are green and blooming.

21. When can visitors see cherry blossoms in Tokyo?

à _________________________________________

22. Can visitors take guided tours in the Imperial Palace every day?

à _________________________________________

23. Which city is more populated, Tokyo or London?

à _________________________________________

24. Which city is safer, Tokyo or London?

à _________________________________________

25. Which city has more visitors, Tokyo or London?

à _________________________________________

VI/ WRITING

A. Put the words in the correct order to make correct sentences.

26. have money/ you/ Where/ if you/ visit/ will/?

à ___________________________________________________________________

27. singers/ the/ of/ popular/ in/ Justin/ the most/ is/ world/ one/.

à ___________________________________________________________________

28. highest/ Ho Chi Minh/ Landmark 81/ is/ the/ city/ building/ in/.

à ___________________________________________________________________

B. Rewrite the following sentences without changing their meaning. Use the given word(s) if any.

29. Without tickets, you won't be able to get in.

à If you______________________________________________________________

30. The city isn’t as peaceful as the countryside.

à The countryside ______________________________________________________

 AI GIẢI GIÚP MÌNH NHANH NHẤT MÌNH ĐÁNH GIÁ CHO 5SAO

Tình huống: Cụ M đã 80 tuổi, từ quê lên sống với con trai ở thành phố. Tuy nhiên, do bận bịu với công việc nên vợ chồng con trai cụ phó thác cho người giúp việc chăm sóc cụ bằng các bữa cơm hằng ngày. Các cháu thì thờ ơ, không trò chuyện, không hỏi thăm, động viên bà nội,... Thấy buồn tủi nên cụ M quyết định bỏ về quê.

      a) Theo em, con trai cụ M đã thực hiện tốt nghĩa vụ đối với mẹ của mình chưa? Vì sao?

      b) Em nên làm những việc gì để đảm bảo thực hiện tốt nghĩa vụ đối với ông bà, bố mẹ, anh chị em trong gia đình?

Cho tam giác ABC vuông tại A, đường cao AH. Trên tia đối của tia AH lấy điểm D sao cho AD = AH. Gọi E là trung điểm của HC, M là trung điểm của DC, F là giao điểm của DE và AC. 

a, Chứng minh 3 điểm H, F, M thẳng hàng

b, Chứng minh HF = $\frac{1}{3}$DC

c, Qua E kẻ đường thẳng vuông góc với AB cắt AH tại P. Chứng minh CP$\perp$BD.

Hai tia đối có bằng nhau không

Câu20:Làm tính chia
a, (6x⁴ - 4x² + 3x - 2):(3x - 2)
b, (6x³ + 3x² + 4x + 2):(3x^2 + 2)
c, (x⁵ + 4x³ + 3x² - 5x + 15):(x³ - x + 3)
Câu21: Thực hiện phép chia rồi viết kết quả dưới dạng A=B.Q+R
a, (x - x² + 3 + x³):(x + x² + 1)
b  (x⁵ + 5x³ - 2x² - 3x⁴ + 3x - 6):(5 + x² - 3x)

Cho tam giác nhọn ABC . Kẻ AH BC ⊥ tại H . Lấy các điểm D E , sao cho các đường AB , AC lần
lược là các đường trung trực của DH EH , .
a) Chứng minh tam giác ADE là tam giác cân;
b) Đường thẳng DE cắt AB AC , lần lượt tại M và N . Chứng minh HA là phân giác góc NHM .
c) Chứng minh rằng góc DAE = 2 lần góc MHB

giúp mik vs ạ. mik camonn nh ạ

Cho tam giác ABC vuông tại A, có B=60 độ. Trên BC lấy điểm H sao cho HB=BA, Từ H kẻ HM vuông góc với BC tại H, (M thuộc AC). TRên tia đối của MB lấy điểm D sao cho MB=MD, từ điểm D vẽ đường thẳng vuông góc với AC tại và cắt BC tại điểm E.

a) Tính C

b) CM BM là tia phân giác của góc ABC 

c) CM BE=DE 

từ đầu thế kỉ X đến thế kỉ XVI, tình hình kinh tế-văn hóa của vùng đất nam bộ có những điểm gì nổi bật?

Cho tam giác ABC vuông tại A.Đường phân giác BD (D thuộc AC). Kẻ DH vuông góc với BC (H thuộc BC).Gọi K là giao điểm của BA và HD .Chứng minh:

a.AD=HD

b.D là trực tâm của tam giác BCK

c.tam giác DKC cân

d.2(AD+AK)>KC

nội dung đoạn văn trên đề cập đến nội dung gì [trong bài văn đừng sợ vấp ngã ]

Cho tam giác ABC có ba góc nhọn (AB<AC). Vẽ về phía ngoài tam giác ABC các tam giác đều ABD và ACE. Gọi I là giao điểm của CD và BE, K là giao điểm của AB và DC. 

a) Chứng minh rằng: $\Delta ADC=\Delta ABE$

b) Chứng minh rằng: $\widehat{DIB}=60°$

c) Gọi M và N lần lượt là trung điểm của CD và BE. Chứng minh rằng $\Delta AMN$ đều

d) Chứng minh rằng IA+IB=ID

e) Chứng minh rằng IA là tia phân giác của góc DIE.

Bảng điểm Tổ 1 lớp 7A của một trường THCS được cho như sau:

Tại ô F2 và F3 hãy viết ra hàm và tham số để tính điểm trung bình cho bạn Lê Hoài An và Lê Thái Anh.