cho a^2+b^2+c^2 =1 +2abc chứng minh rằng: |(a-bc)(b-ac)(c-ab)|= |(1-a^2)(1-b^2)(1-c^2)|

Giúp mik 2 câu này vs các bnn!! Câu 1. Lập bảng tóm tắt những đặc điểm cơ bản của chế độ phong kiến phương Đông, phương Tây và rút ra nhận xét. Câu 2. Nhà Lý đã làm gì để củng cố quốc gia thống nhất?

Chỉ cần câu cuối nha giải nghĩa rõ ràng ko mk báo vi phạm đấy .Bài sắp xếp

Bản thân bạn – con người độc đáo nhất trên thế gian này. Bạn biết chăng, thế gian này có điều kỳ diệu, đó là không ai có thể là bản sao 100% của ai cả. Bởi thế, bạn là độc nhất, tôi cũng là độc nhất. Chúng ta đều là những con người độc nhất vô nhị, dù ta đẹp hay xấu, tài năng hay vô dụng, cao hay thấp, mập hay ốm, có năng khiếu ca nhạc hay chỉ biết gào như vịt đực… Vấn đề không phải là vịt hay thiên nga. Vịt có giá trị của vịt, cũng như thiên nga có giá trị của thiên nga. Vấn đề không phải là hơn hay kém, mà là sự riêng biệt. Và bạn phải biết trân trọng chính bản thân mình. Người khác có thể đóng góp cho xã hội bằng tài kinh doanh hay năng khiếu nghệ thuật, thì bạn có thể đóng góp cho xã hội bằng lòng nhiệt thành và sự lương thiện.” (Phạm Lữ Ân – Nếu biết trăm năm là hữu hạn, NXB Hội Nhà văn, 2012) Câu 1 (0,5 điểm): Xác định phương thức biểu đạt chính của văn bản? Câu 2 (0,5 điểm): Xấc định 1 thành ngữ trong đoạn văn trên? Giải nghĩa thành ngữ đó? Câu 3 (1,0 điểm): Nêu nội dung đoạn trích trên Câu 4( 1 điểm): Theo em, bài học ý nghĩa nhất rút ra từ đoạn trích trên là gì? Vì sao em cho là như thế ?

cho tam giác ABCcosa(2,-1);B(4,5);C(-3,2) .Phương trình tông quátb BH

Giúp mình với đúng mình cho 5 sao

V. Identify the underlined word or phrase that needs correcting. ( 0.6 points) 1. Nick said that he wants to stay in Viet Nam longer. A B C D 2. Water pollute in the lake has made the fish die A B C D 3. She decided leaving early although it was raining heavily. A B C D C. Reading (2,5 points) I. Read the passage and choose the bcorrect answer. ( (1.0 points) Percy Lebaron Spencer (1894 1970) was an American engineer and inventor. Like several great inventors, Dr. Percy Spencer made most famous discovery by his accident. He was testing a new piece of radar technology called "magnetron" in a laboratory in 1946 when the candy bar in his pocket started to cook. This interested him, so he put some corn next to the magnetron and that cooked too! The next day Dr. Spencer and his colleague placed an egg near the magnetron. Dr. Spencer's curious colleague took a step closer to check the egg just in tim for it to explode and cover his face! After a short time, the company Dr. Spencer worked for was trying to find a more controlled way to use this microwave energy to cook food. In 1947, the first microwave oven came available. It was almost tall and weighed over 350 kilos! two metres Finally in 1966 technology became advanced enough to produce microwaves for everyday domestic use. By then they were much smaller and easier to control. Nowadays you can see microwave ovens all over the world. They are here to stay. 1. Dr. Spencer discovered that A. a new piece was called "magnetron C, magnetron could cook food B. a candy bar could cook his pocket D. invention often happened by accident 2. The first microwave was invented in………… A. 1946 B. 1947 C. 1966 D. 1970 3. Which of the following is NOT true, according to the passage? A. Dr. Percy Spencer was a radar expert. B. His colleague had a minor accident in the experiment. C. The first microwave was hardly convenient to use. D. Microwave ovens are now part of our life. 4. The phrase "by accident" in the first sentence mostly means……………….. A. on purpose B. by the way C. not controlled D. not planned 5. What could be the best title for the article? A. The Uses of Microwave 0vens B. The History of Microwave ovens C. The Story of Dr Percy Spencer D. The inventions of Dr. Percy Spencer II. Look and read. Fill each gap with one word from the box. (1.5 points) will and opportunity from around thousands Millions of people …..(1) .. the world want to learn English .Many of them go to the USA and other English speaking countries to study at language schools, especially in the summer .There are (2)… of schools .They offer courses for children ,teenagers …(3) …. adults. If you go to a language school, you should try to speak English as much as possible. Students can stay with a local family .This is a good….(4)….. to improve your English and to learn a lot about everyday life .You should try to talk to students …. (5) …. other countries .This ..(6).. help you with your English and will also show how important English is for international communication 1. 2. 3. 4. 5. 6. D. Writing (2,5 points) I. Rearrange the words in the correct order to make meanings sentences. (1.25point) 1. would / I / Nam, / were / I / If / study / harder. / =>............................................................................................................................................... 2. that / suggests / we / practise English / Hung / everyday. / should / =>............................................................................................................................................... 3. inhabitants/ might travel/ Tom thought/ of Venus/ by buggy. => ……………………………………………………………………………………………. 4. use/ abbreviations/ Teenagers/ often/ when texting. => ……………………………………………………….…………………………………… 5. English speakers/ increasing/ the/ fast/ of/ number/ world/ is/ the/ in/. ……………………………………………………………………………… III. Complete the second sentence so that it has a similar meaning to the first one. (1.25 points) 1. “ You speak English better than me.” He said to Lan => He told Lan that ……………………………………………..………………………… 2. People use too much fertilizer, so lands are spoiled. => If……………………………………………………………..…………………………… 3. It takes Nam two hours to do his homework every day. => Nam spends …………………………………………………………………………….. 4. People need to repair the road in front of my house. => The road in front of my house……………………….…………………..……………… 5. Peter is the tallest in my class. => No one ……………………………………………………………………………..

Các bn giúp mik vs mik cần gấp ạ

B. Phonentics – Language (10 points) I. Choose the word whose underlined part is pronounced differently from the others. (0.6 point) 1. A. managed B. damaged C. reached D. changed 2. A. reads B. notebooks C. cups D. defeats 3. A. eruption B. energy C. extensive D. replace II. Find the word which has a different stress pattern from the others. . (0.4 point) 1. A. reputation B. description C. suggestion D. pollution 2. A. economic B. volcanic C. disappointed D. scientific III. Choose the best answer to complete the following sentences. ( 2 points) 1. Lan told that he ________ cycling the next day. A. will go B. have gone C. would go D. has gone 2. Which TV programme ________ at 9 p.m tomorrow? A. did you watch B. will you watch C. will you be watching D. you watch 3. Air ________ is causing many health problems in our cities today. A. pollutes B. pollution C. polluting D. polluted 4. If I ________ the president, I would do to help the environment. A. be B. are C. had been D. were 5. Many people ________ before the storm. A. had left B. left C. leave D. has left 6. All our English teachers are _________ speakers. A. native B. original C. foreign D. abroad 7. Hundreds of people were made_________ after the flood. A. homesick B. helpless C. homeless D. endless 8. Don’t drink that water. It’s _________. A. damaged B. pure C. clean D. contaminated 9. I knew they were talking about me …… they stopped when I entered the room. A. because B. so that C. despite D. therefore 10. When I came to visit her last night , she ………. a bath . A. had B. was having C. were having D. is having IV. Give the correct forms of the verbs in brackets. (1,4 points) 1. Look at those clouds – I think it (rain) ……………………… 2. At this time yesterday, I (lie) …………………………. on a beach on Phu Quoc Island. 3. If we recycle more, we (help) …………………………. the Earth. 4. Four countries (visit) ……………………………... by John so far. 5. She asked me ( keep ) ................................................. silent in the class. 6. In your place, I (go) ……………………………… out with her. 7. Although I was tired, I finished all work before (go)…… ……….…………….... to bed.

Câu 2 : Viết PTHH biểu diễn chuyển đổi hoá học sau: ( 1) C2H4 tạo thành C2H5OH (2) C2H5OH tạo thành CH3COOH ( 3) C2H5OH tạo thành C2H5ONa (4) C2H5OH tạo thành CH3COO C2H5