Gọi x1,x2 là hai nghiệm của ptrinh x²-mx+(m-2)².Tìm gtln-gtnn A=x1x2 + 2x1 +2x2

Giúp mình câu 49 và 50 nha các bạn iu😊

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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (17). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A. heroically B. hero C. heroic D. heroine 9 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (21). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A. assignment B. development C. work D. responsibility 10 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (20). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A. France war B. French war C. war France D. war French

Choose the word whose stressed pattern is pronounced differently from the others . A. improve B. support C. invent D. educate 2 Combine two sentences into a new one, using the words in brackets. Do not change the given words in any way. Write the new sentences on your answer sheet. Question 22. Nick: “ I like watching films on science and technology.” (said) A. Nick said that he likes watching films on science and technology. B. Nick said that he would like watching films on science and technology. C. Nick said that he had liked watching films on science and technology. D. Nick said that he liked watching films on science and technology. 3 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (18). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A. to study B. studied C. study D. studying 4 Choose the best answer A, B, C or D to complete the sentence. Question 11: Air pollution, together with littering has _______many problems in our big cities today. A. caused B. bought C. made D. affected 5 Choose the best answer A, B, C or D to complete the sentence. Question 7: Robots in our home will do all the housework for us, and ______will become lazy and inactive. A. therefore B. because C. as D. so 6 Choose the best answer A, B, C or D to complete the sentence. Question 10: Are all type of pollution harmful ______the health of humans and animals? A. with B. of C. to D. for 7 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 13. “Would you pick the kids up from school this afternoon?” “__________” A. Sure B. I don’t think so. C. Really? D. No, I am afraid I can’t.

Bài 7: Một bếp ăn dự trữ gạo đủ cho 120 người ăn trong 50 ngày. Nhưng sau đó,có một số người đến thêm nên số gạo chỉ đủ ăn trong 30 ngày. Tính số người đến thêm?

Rewrite the following sentences, beginning with the given words. 1. This is the third time we have walked along the beach together. We have ............................................. 2. I haven’t met that man here before. It’s the ............................................................................................ 3. This is the second time I have played truant. I have ............................................................................... 4. This is the first time he has been rude to her. He has ............................................................................. 5. They have never had an argument before. This is .................................................................................. 6. I started doing my homework 2 hours ago. I have .................................................................................. 7. We began painting the walls yesterday. We ............................................................................................ 8. It started snowing half an hour ago. It .................................................................................................... 9. They began to build that bridge in July. They ......................................................................................... 10. Our current manager started working here 10 years ago. Our current manager has ............................. 11. I have studied English for 3 years. I began ............................................................................................. 12. It’s a long time since he heard from his brother. He hasn’t .................................................................... 13. It’s 3 years since I last wrote to her. I haven’t ........................................................................................ 14. They last invited me 5 years ago. They haven’t ...................................................................................... 15. The last time I saw him was in 1995. I haven’t ...................................................................................... 16. I haven’t heard from Sarah for a couple of months. The last …............................................................. 17. I last saw him 3 years ago. I haven’t …................................................................................................... 18. She’s the most beautiful girl I’ve ever seen. I have .…........................................................................... 19. It’s the fastest car he’s ever driven. He has .…....................................................................................... 20. It’s the most expensive watch I’ve ever bought. I have …...................................................................... Write complete sentences with the given words. 1. If/ she/ work hard/ she/ have/ enough money / make ends meet. 2. He/ usually/ get embarrassed/ if he/ make a mistake/ when speaking English. 3. It/ not matter/ if/ some of you/ come/ late. 4. When/ Mary/ listen to classical music/ she/ always/ feel happy. 5. My dog/ sit down/ when/ I/ say 'sit'. 6. If/ son/ study hard/ he/ usually/ get/ good grades/ school. 7. Ben/ often/ play loud music/ if/ he/ be/ at home alone. 8. If/ you/ sit/ in the sun for too long/ you/ get burned. 9. If/ it/ war film/ may/ quite violent. 10. If/ you/ write down/ pin number/ someone/ may/ use/ it. Rewrite the following sentences, beginning with the given words. 1. I have made plans to go to the museum of modern Art with Mary on Saturday. I am ……………….. 2. If I don’t practise the piano every evening, I forget how to play it. Unless ............................................ 3. Unless people eat, they get hungry. If .................................................................................................... 4. If I don’t get home on time, my dad shouts at me. Unless ...................................................................... 5. Unless I feel very well, I stay in bed. If I ............................................................................................. 6. We have made plans to visit Paris next month. We are ......................................................................... 7. It’s possible that it’s true. It could ..................................................................................................... 8. It’s possible that he’ll want to borrow my notebook. He may .............................................................. 9. It’s possible that we won’t go out on Sunday. We might ........................................................................ 10. It’s possible that we won’t win the match. We may ............................................................................

Toàn bộ nguyên tắc xác định số oxh?

viết các biểu thức sau dưới dạng lập phương của tổng hoặc hiệu B= (x/2+y)^3 -6(x/2+y)^2z+ 6(x+2y)z^2- 8z^3 mọi người giúp em với ạ em đang cần gấp

Câu 1. (1,0 điểm) Xếp các từ in đậm trong đoạn văn dưới đây vào bảng phân loại cho phù hợp: "Sau trận bão, chân trời ngấn bể sạch như tấm kính lau hết mây hết bụi. Mặt trời nhú lên dần dần, rồi lên cho kì hết. Tròn trĩnh và phúc hậu như lòng đỏ một quả trứng thiên nhiên đầy đặn. Quả trứng hồng hào thăm thẳm và đường bệ đặt lên một mâm bạc đường kính mâm rộng bằng cả một chân trời màu ngọc trai nước biển hửng hồng. Y như một mâm lễ phẩm tiến ra từ trong bình minh để mừng cho sự trường thọ của tất cả những người chài lưới trên muôn thuở biển Đông.” (Cô Tô - Nguyễn Tuân) Động từ Tính từ Quan hệ từ