Cho hệ phương trình\(\left\{{}\begin{matrix}3x-my=-9\\mx+2y=16\end{matrix}\right.\)

b)    Chứng tỏ rằng hệ phương trình luôn luôn có nghiệm duy nhất với mọi m

d)    Tìm giá trị nguyên của m để hai đường thẳng của hệ cắt nhau tại một điểm nằm trong góc phần tư thứ IV trên mặt phẳng tọa độ Oxy

e)     Với trị nguyên nào của m để hệ có nghiệm (x ; y) thỏa mãn x + y = 7

Mình đang cần gấp, nhờ các bạn!!!

SỞ GD&ĐT .....       ĐỀ LUYỆN SỐ 1

ĐỀ ÔN LUYỆN TRONG THỜI GIAN NGHỈ DỊCH COVID TỪ NGÀY 17-2 ĐẾN 21-2-2021 ĐỀ THI MÔN: TIẾNG ANH 9 Thời gian làm bài: 60 phút, không kể thời gian giao đề.

Choose the word whose underlined part is pronounced differently from the others.

1.   A. chemistry         B. kitchen                    C. watch                      D. catch

2.   A. moment                        B. slogan                     C. comb                       D. opposite

3.   A. produce                        B. huge                        C. lunar                      D. cure

Choose the word that has a different stress pattern from the others.

4. A. traffic                 B. dancer                     C. cycling                    D. balloon

5. A. polite                  B. receive                    C. copy                        D. obey

Choose the best answer from the four options given (A, B,C, or D) to complete each sentence.

6. After I found all the information I needed, I ___________ the computer.

A. turned off               B. switched on                        C. looked for                           D. put off

7. Japan is the ___________ developed country in the world.

A. most second           B. second in most       C. second most                       D. two most

8. I haven’t written any letters home since I_________here.

      A. came                             B. come                       C. coming                    D. comes                                

9. It’s time we went. If we don’t leave now, we_________the last train.

      A. miss                              B. will miss                 C. would miss             D. missed

10.   The government should do something to help_________.

A. the poors               B. the poor ones           C. poor                        D. the poor

11. This laptop is much more user-friendly, but it costs ___________ the other one.

A. so much as  B. as many as              C. twice as much as                D. twice as many

12. Today’s cities are ___________ than cities in previous times.

A. lots larger               B. much larger             C. as large                               D. the largest

13. They asked me a lot of questions, most of_________I couldn’t answer well.

      A. whom                           B. whose                     C. which                      D. that                        

14. A: What is your nationality? –B: ....................

A. I grow up  Vietnam                                                B. I come to Vietnam

C. I live in Vietnam                                                    D. I am from Vietnam

15. What would you like to drink? - …………

A. Thank  you B. Coffee, please            C. Yes, please                     D. No, I don’t

Choose the correct answer (marked A, B, C or D) that has the OPPOSITE MEANING with the underline words.

16. The doctor advised Peter to give up smoking.

A. stop                                    B. continue                  C. finish                      D. consider

17. The best time to visit is during the dry season, from October to April, when the hard forest rain is over.

            A. wet                         B. engaging                 C. obvious                   D. cordial

Read the paragraph and choose the best answer

           Being overshadowed by Ha Long Bay to the north, Cat Ba Island is often left out of the itineraries of the majority of travellers coming to Viet Nam. Nevertheless, Cat Ba Island is one of the most underrated destinations in Viet Nam.

The massive island of Cat Ba is a fantastic destination for ecotourism and adventure activities in Northern Viet Nam. Cat Ba National Park, which was established on 31st March 1986, is one of the most ecologically diverse national parks in Viet Nam. The park possesses seven different ecosystems, both underwater and inland. It is home to thirty-two types of mammals, along with seventy bird species, and more than a thousand species of plants, hundreds of which can be used as medicines.There are several different hiking and trekking routes through rugged and forested mountain within Cat Ba National Park. These routes are also divided by different levels of difficulty, so travellers don’t have to be worried if their fitness is not very good. In addition, travellers can take a side visit to explore the exquisite Trung Trang cave, or discover the traditional village of Viet Hai.

18. Many travellers choose not to visit Cat Ba Island because ___________.

A. they think Ha Long Bay is much better                 B. it is not a good destination for tourism

C. there is too much rain there                                    D. it is too far from Ha Long Bay

19. Cat Ba Island is suitable for ___________.

A. scientific research and exploration             B. ecotourism and adventure activities in Northern Viet Nam

C. experiencing urban life                               D. many indoor activities

20. Which of the following is NOT true about Cat Ba National Park according to the passage?

A. Hiking and trekking in Cat Ba National Park requires a high level of fitness.

B. It is one of the most diverse national parks in Viet Nam.

C. There are seven different ecosystems in Cat Ba National Park.

D. It was established in 1986.

21. The word "rugged" in the passage is closest in meaning to ___________.

A. even                                    B. smooth                                C. flat              D. uneven

22. The word "exquisite" in the passage is closest in meaning to ___________.

A. quiet                                   B. ugly                                                C. plain            D. beautiful

Choose the underlined part (marked A, B, C or D) that needs correction.

23. My mother always made me to wash my hands before every meal.

                                          A               B                             C       D

24. Although his leg was broken. However, he managed to get out of  the car.

                       A                                     B                                 C                    D

25. The information I got from the assistant was such confusing that I didn’t know what to do.   

         A                                                                          B                        C                                   D

Read the following passage, then choose the correct answer to questions 26- 35.

            The traffic light signal was invented by a railway signaling engineer. It was installed (26)_________The House of Parliament in 1868. It (27)_________like any railway signal of the time, and was operated by gas. (28)_________, it exploded and killed a policeman, and the accident (29)_________further development until cars became common.

            (30)_________traffic lights are an American invention. Red-green (31)_________were installed in Cleveland in 1914. Three-color signals, (32)_________by hand from a tower in the (33)_________of the street, were installed in New York in 1918. The (34)________lights of this type to (35)________in Britain were in London, on the junction between St James’s street and Piccadilly in 1925.

26.   A. outside                       B. out                          C. out of                      D. outdoors

27.   A. resembled                   B. looked                    C. showed                   D. seemed

28.   A. However                    B. Therefore                C. Although                D. Despite

29.   A. forbade                       B. avoided                  C. discouraged                        D. disappointed

30.   A. New                           B. Recent                    C. Modern                   D. Late

31.   A. methods                     B. systems                   C. means                     D. ways

32.   A. worked                       B. operated                 C. turned                     D. held

33.   A. heart                           B. focus                       C. halfway                  D. middle

34.   A. original                       B. primary                   C. first                         D. early

35.   A. show                           B. appear                     C. happen                    D. become

Choose the correct answer (marked A, B, C or D) that has the CLOSET MEANING with the underline words.

36. My mom is always bad-tempered  when I leave my room untidy.

A. feeling embarrassed                                   B. talking too much

C. very happy and satisfied                D. easily annoyed or irritated

37. After her mother died, she was raised  by her grandparents.

A. grown up                B. brought up              C. come into                D. put up

Choose the correct answer (marked A, B, C or D) to each of the following questions.

38.  It is  two months___________.

       A. since it has rained                                            B. since last it rained  

       C. since it last rained                                            D. since it was last rained

39.  He couldn’t set up a new world record___________.

       A. although he tried hard                                     B. even though he tried hard

       C. in spite of the fact that he tried hard D. All are correct.

40.  I really wish____________ but I didn’t.

       A. I had invited her to the party              B. had I invited her to the party

       C. I invited her to the party                                 D. I has invited her to the party

Listen to what the students say and choose the correct answer A, B, C or D to fill in the blank.

Tra:

41. There’s an extensive ________  of artefacts tracing Viet Nam’s history.

A. collection                B. demonstration        C. gathering               D. keeping

42. It’s also near Hoan Kiem Lake and the Old Quarter, so you can spend time looking round and exploring Vietnamese  ________.

A. tradition                 B. culture                    C. literature                 D. arts

Nam:

43. I’m fascinated by traditional ________.

A. arts                         B. handicrafts C. artefacts                  D. culture

44. My friend’s relatives live there and they own a ________.

A. shop                        B. bookshop                C. workshop                D. workplace

Hoa:

45. There are lots of trees from different ________ , a lake, and a small hill.

A. countries                 B. nations                    C. cities                       D. places

46. Sometimes I just sit on the bench, watching people dancing or playing _______.

A. games                     B. badminton              C. sports                      D. volleyball

Listen to Nick talking to Mrs Ha and choose the correct answer to each of the following questions.

47. What type of family did Mrs Ha live in?

A. small family                                                B. extended family

C. one - parent family                         D. nuclear family

48. What did people in her family share?

A. Clothes                   B. Bathroom               C. Shoes                      D. Food

49. Why were meal times great?

A. Because they could have time together everyday.           

B. Because they could eat.

C. Because they didn’t have to work                        

D. Because they had free time then.

50. What was her grandma like?

A. She was helpful                                          B. She was very hardworking

C. She was very old                                        D. She was humorous

---------THE END---------

Nguyễn Lê Phước Thịnh CTV

                                                                         Nguyễn Trần Thành Đạt CTVVIP

Cho đường tròn (O) đường kính  C là điểm trên đường tròn (O) sao cho  Vẽ Chứng minh vuông. Tính độ dài CH và số đo  (làm tròn đến độ)Tiếp tuyến tại B và C của đường tròn (O) cắt nhau tại D. Chứng minh Tiếp tuyến tại A của đường tròn (O) cắt BC tại E. Chứng minh: Gọi I là trung điểm của CH. Tia BI cắt AE tại F. Chứng minh: FC là tiếp tuyến của đường tròn (O).Cho đường tròn (O) đường kính  C là điểm trên đường tròn (O) sao cho  Vẽ Chứng minh vuông. Tính độ dài CH và số đo  (làm tròn đến độ)Tiếp tuyến tại B và C của đường tròn (O) cắt nhau tại D. Chứng minh Tiếp tuyến tại A của đường tròn (O) cắt BC tại E. Chứng minh: Gọi I là trung điểm của CH. Tia BI cắt AE tại F. Chứng minh: FC là tiếp tuyến của đường tròn (O).

Cho tam giác ABC vuông tại A nội tiếp đường tròn (O, R) có BC là đường kính và AC=R. Kẻ dây AD vuông góc với BC tại H.

1) Tính độ dài các cạnh AB, AH theo R;

2) Chứng minh rằng HA.HD=HB.HC;

3) Gọi M là giao điểm của AC và BD. Qua M kẻ đường thẳng vuông góc với BC cắt BC ở I, cắt AB ở N. Chứng minh ba điểm N, C, D thẳng hàng;

4) Chứng minh AI là tiếp tuyến của đường tròn (O, R).

Cho mạch điện gồm: 1 cầu chì, 1 ổ điện, 1 công tắc hai cực điều khiển hai đèn sợi đốt mắc nối tiếp với nhau. Mạch điện Sử dụng nguồn xoay chiều một pha. Vẽ sơ đồ nguyên lí và sơ đồ lắp đặt.

Dinh Quang VinhbuithianhthoCulong12345PHAMLamkhánhdư

I/ Do as directed in t he brackets.

1. The boy is living in Tran Hung Dao Street. He is my friend. (using the -ing participles)

2.The garden is watered every morning. It is full of flowers. (using the -ed participles)

3. Can I give some advice on your study habit? (using "Would/Do you mind...?")

4. Could you tell me how you learned english at school? (using "Would/Do you mind?")

5. They / do / homework / 8.00 last night (Write the sentences using the past progressive tense)

6.It / not easy / answer / these questions. (Write the sentences with: "Adj + to-infinitive")

7. They pass all the exams. They are lucky. (Combine each pair of the sentences "Adj + to-infinitive")

8. Tom said:"My friend is coming next week". (Change into reported speech)

II/ Supply the correct form or tense of the verbs in parentheses

1. He shows the people how (protect)......the environment.

2. Last year the weather (be)......too hot to sunbathe at noon.

3. She (do)........her homework at 7 o'clock last night.

4. He sterted (go).......to school when he was 6

III/ Do as directed

1. Following your directions is difficult. (Rewrite the sentence using "adj + to-inf")

It is........................................

2. "I don't watch Tv in my free time" (Rewite the question in reported speech)

He said.................................

3. They built this temple many years ago. (Turn into passive)

This temple.............................

4. Would / mind / turn off / light? (Use the words given as cues)

................................

5. She / askes me / whether / ready / go / to school. (Complete the sentence. Use the words given as cues.)

......................................

IV/

1. The boy (stand / stood / to stan / standing) over there is one of my close friends at school.

2. Your english test must (do / to do / be done / doing) carefully

3.Have you been to Ha Noi (ever / yet / already / since)?

Nguyễn Thị Ngọc ThơVy Le🍀🧡_Trang_🧡🍀

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