1.câu A 2.câu B 3.câu C 4.câu D

Cho hàm số y = 2x + b Tìm b biết rằng a) Với x = 4 thì hàm số y = 2x + b có giá trị bằng 5 b) Đồ thị hàm số đã cho cắt trục tung tại điểm có tung đồ = -3 c) Đồ thị hàm số đã cho đi qua điểm A(1;5)

Xác định a và b để đồ thị của hàm số y=ax+b đi qua hai điểm A(5; 3)và B(4; 5) Trả lời: a=..... b=.... .

Lo' trong tiếng anh nghĩa là gì vậy ạ?

cho đơn thức -3x²y³z.a.tìm ba đơn thức đồng dạng với đơn thức đã cho.b.tính tổng của cả bốn đơn thức.c.tìm bậc của đơn thức tổng. Mình đang cần gấp mong mọi người giúp

1.câu A 2.câu B 3.câu C 4.câu D

Exercise 1: Put the verbs in brackets. Present simple or present continuous. 1. I (not/belong) to this particular government committee. 2. Hurry? The bus (come). I (not/want) to miss it. 3. Martha is a vegetarian. She (not/eat) meat. 4. I (look) for the manager. I can’t find him anywhere. 5. We are successful because we (take) the time to talk to our customers. 6. John (deaf) with all the enquiries about sales. 7. At the moment we (make) a training video for Siemens. 8. (you/know) what Mr. Brown is doing? He is not in his office. 9. Unemployment (fail) and is now down to 5.6%. 10. Jane is doing some research in the library. She needs it for a book she (write). Exercise 2: Put the verbs in brackets: Present perfect or present perfect progressive. 1. How long (you/know) Gerry? 2. You look dirty. What (you/ do) all day? 3. How many times (Charles/ visit) New York? 4. She (learn) French words for hours, but she still doesn’t remember all of them. 5. The children (watch) videos for two hours. 6. (he/ study) hard today? 7. Sorry, I’m late, (you/ wait) for long? 8. We (not/ see) Lisa recently. 9. He (write) his essay all day, but he hasn’t finished yet. 10. How long (he/ wait) for her?

giải pt (x+4)/96+(x+3)/97=(x+1)/99+(x+2)/98

Một chủng tụ cầu vàng được cấy trên 2 loại môi trường sau: - Môi trường A: nước, muối khoáng, glucôzơ, vitaminB1. - Môi trường B: nước, muối khoáng, glucôzơ. Sau khi nuôi ở tủ ấm 37oC một thời gian môi trường A đục (có nhiều vi khuẩn), môi trường B trong suốt. Vậy: a) Nước, muối khoáng, glucôzơ, vitamin B1 có vai trò gì đối với chủng tụ cầu vàng? b) Vitamin B1 còn được gọi là gì? Gọi tên chủng tụ cầu vàng này là gì? c) Có thể dùng chủng tụ cầu vàng này để kiểm tra thực phẩm có vitamin B1 hay không? d) Nếu một chủng tụ cầu vàng khác có thể phát triển trên môi trường B. Dựa vào nhân tố sinh trưởng vitamin B1 có thể gọi tên chủng tụ cầu vàng này là gì?

I. Fill in the blank with "have" or "has" 1. During the five years, John ________ had fifteen different jobs. 2. He ________ worked in banking sector. 3. Teddy ________ been a teacher since 2004. 4. I ________ been on holiday for six days. 5. I and Kate ________ started our own company this year. 6.________ your mother learned how to drive? 7. They ________ never been to Madrid. 8. ________ you ever met anyone famous? II. Put the verbs in brackets into the present perfect tense. 1. Tom (see) _________________ this film before. 2. I (finish) ________________________ my exercise already. 3. They (live) __________________ here since 1990. 4. Mary (never/ be) _____________________ to Hanoi. 5. The students (discuss) ___________ the question recently. 6. Your mother (ever/wash) _________________ her car? III. Choose the best answer to complete each of the following sentences. 1. Peter _____________ to that museum twice. A. have been. B. was C. will be. D. has been 2. We __________ to Da Lat several times. It’s a foggy city. A. were. B. have been. C. were being. D. had been 3. Huy ___________ learnt English for 5 years. A. have. B. to have. C. having. D. has 4. This is the most interesting novel _____________ A. I have to read. B. I had read. C. I’ve never read. D. I’ve ever read 5. This is _______ expensive dictionary I have. A. more B. most C. the more D. the most 6. My parents ____________ abroad for a week. A. have be. B. have been. C. having be D. having been 7. Je _______ London 2 years ago and I _______________________ him since then. A. left/ hadn’t seen. B. left/ haven’t seen C. was leaving/ haven’t seen. D. left/ didn’t seen 8. John usually _________ swimming with my friends on the weekends A. go. B. went. C. goes. D. has gone 9. Have you ever _________ of that? A. hear B. heard C. hears D. hearing 10. That is the most interesting film I ___________. A. has ever watched B. has ever watch C. have ever watched D. have ever watch IV. Rewrite the sentence, using the given clues 1. I/live/Kon Tum/ nearly eleven years/. I/move/Kon Tum/2010. .................................................................................. 2. My sister/never/eat /durian/before. .................................................................................. 3. I/ not/ meet/ my old teacher since 2015. .................................................................................. 4. You/ ever/ be/ New York? .................................................................................. 5. This/ delicious/ dish/ my mother/ever/cook. .................................................................................. 6. You/ finish/ your writing/ reading exercises/ yet? ..................................................................................