xin giúp minh với nhanh lên các bro trước 9 h 30'

Để hỗ trợ tiêu thụ nông sản cho bà con vùng dịch tỉnh Bắc Giang,khu phố nhà em gồm 3 dãy nhà(A,B,C)Để hộ trợ tiêu thụ nông sản cho bà con vùng dịch Covid-19 tỉnh Bắc Giang , đã mua ủng hộ tất cả 361,5 Kg vải thiều . Số vải thiều dãy A mua ít hơn trung bình cộng tổng số vải thiều của cả khu phố là 9kg a) Hỏi dãy A mua ủng hộ bao nhiêu Ki-lô-gam vải thiều ? b) Nếu bớt 1/5 số vải thiều dãy B đã mua thì số vải thiều của dãy C bằng 5/6 số vải thiều của dãy B khi đó . Tính khối lượng vải thiều thực tế mỗi dãy B , dãy C mua ủng hộ .

Dùng QT Đổi dấu THPT: `1/(x- 5x^2) - (25x - 15)/(25x^2 - 1)`

Cho hàm số y=-x³+6x²+2mx-3. Tìm m để hàm số đồng biến với mọi x thuộc (1;3). Làm theo cách lập bảng biến thiên

I. PHONETICS 1.1. Choose the word whose main stress is different from the others. 1. A. promotion B. engineering C. divorce D. impossible 2. A. active B. serious C. selfish D. announcement 1.2. Choose the word whose underlined part is differently pronounced from the others. 1. A. arrival B. champion C. athletics D. accountant 2. A. surgeon B. underground C. interrupt D. button II. READING COMPREHENSION 2.1. Read the text below and decide which answer A, B, C, or D fits each space. People in many countries grow fresh water fish from eggs. They move the small fish into lakes and rivers. The fish live and (1) ________there. People go (2) ________in these lakes and rivers. They enjoy catching fish because fish is also good food. Now the Japanese grow salt water fish. Most of them are yellow tail fish. Workers grow the fish from eggs. Every time they feed the fish, they play (3) ________of piano music. The fish (4) ________that piano music means food. When the fish are small, the Japanese put them into the ocean near the land. The fish find some of their (5) ________food. Workers also feed them. They play the same piano music. The fish (6) ________know the music. They swim toward it and (7) ________the food. In (8) ________months the fish are large. The Japanese play the same music. The fish swim toward it and the workers (9) ________them. The Japanese get about 15 percent of their seafood (10) ________farms in the ocean. 1. a. bred b. born c. grow d. develop 2. a. enjoying b. fishing c. shopping d. catching 3. a. songs b. films c. tapes d. lots 4. a. think b. recognize c. realize d. learn 5. a. own b. private c. self d. individual 6. a. recently b. mostly c. nearly d. already 7. a. see b. find c. bite d. hold 8. a. few b. a few c. couple d. many 9. a. grasp b. catch c. seize d. hold 10. a. on b. of c. from d.in III. GRAMMAR AND VOCABULARY 3.1. Choose the best option to complete the sentences. 1. The ticket machine in the station was out of ......... so I couldn’t buy a ticket for my train. A. Order B. broken C. vacant D. work 2. ............is a complete mystery how they ever got there in that car. A. There B. That C. It D. This 3. We had so many problems with the car that ............we sold it and bought a new one. A. At the end B. in the end C. by the end D. to the end 4. I did not agree with the decisions the............made last night. We lost the game because of him. A. Competitor B. supporter C. champion D. referee 5. His parents thinks it is time he ............married. A. Will get B. gets C. got D. would get 6. I had to ............early last morning because I was going to board a ferry but I had to wait to check out. A. Reach B. unpack C. set off D. arrived 7. Before entering the room you’d better.........your shoes. A. Carry on B. take off C. take in D. put on 8. They saw bright............in the sky during the storm. A. Flood B. freeze C. hurricane D. flashes of lightning 9. I regret to inform you that your............for this post has not been successful. A. CV B. career C. application D. celebration 3.2. Put the correct form of words. 1. I would be grateful if you could tell me something about the pay and the possibilities of ........................(PROMOTE) 2. Sheila is very .....................(PROFESSION). She turn up on time, works hard and does a good job. 3.3. Synonyms and antonyms Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. 1. Many scientists agree that global warming poses great threats to all species on Earth. A. risks B. annoyances C. fears D. irritations 2. When their rent increased from 200 to 400 a month, they protested against such a tremendous increase. A. light B. huge C. tiring D. difficult 3.4. CONVERSATION 1. Jim: “What about collecting used paper, bottles and plastic bags everyday?” Ha and Mai: “ _______ ” A. Because they can pollute the environment B. How come? Who can do that? C. That’s a very good idea. Let’s do that. D. What about this weekend 2. Phuong: “I’m taking my TOEFL test tomorrow” Daisy: “ ____________ ” A. Good fortune B. Good luck C. Good outcome D. Good success IV. WRITING 4.1. Rewrite the sentences without changing their meaning using the given words. 1. She started working as a secretary five years ago. She has .......................................................................................... 2. "Don't forget to phone the office," she told him. She reminded ................................................................................. 3. The furniture was so expensive that I didn't buy it. The furniture was too............................................................ 4. You may get hungry on the train, so take some sandwiches. (CASE) ........................................................................................

cali hộ mik chữ Huy nha YC: đẹp, xấu=bc

1/.Thực hiện phép nhân, rút gọn biểu thức rồi tính giá trị. x.(x^3-y)+x^2(y-x^2)-y(x^2-3x) với x=1/4, y=-2006 Giúp mình với😁😁😁😁😁

Chứng minh rằng nếu (a ² + b ²)(x ² + y ²) = (ax + by) ² với x,y khác 0 thì: a/x = b/y

Find lỗi and sửa: 1. No sooner had I got off the bus than I realised my two-hundred-dollar camera had been disappeared. A. no sooner B. realised C. two-hundred-dollar D. had been disappeared 2. Air pollution, together with littering, are causing many problems in our large, industrial cities today. A. with B.are C. many D. in our large

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