`x^50 = x`
`→ x^50 - x = 0`
`x . x^49 - x = 0`
`x . (x^49 - 1) = 0`
`→ x = 0 hoặc` `x^49 - 1 = 0`
`+) x = 0 → x = 0 (loại` `vì ``x ne 0)`
`+) x^49 - 1 = 0`
`x^49 = 1`
`→ x = 1`
`⇒ x = 1`
`x^50=x`
⇔`x^50-x=0`
⇔`x(x^49-1)=0`
⇔\(\left[ \begin{array}{l}x=0\\x-1=0\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\)
Vì `x` khác `0`
Nên `x=1` thỏa mãn
Đề 1: Nhà văn, nhà viết kịch Anh tài ba William Shakepeare từng viết: “Mọi việc trở nên tốt đẹp hơn hay tồi tệ đi đều bắt nguồn từ suy nghĩ của bạn”.Em có đồng ý với ý kiến trên hay không? Trình bày suy nghĩ của em bằng một đoạn văn từ 8 – 10 câu. Trong đoạn văn có sử dụng 01 câu rút gọn và 01 từ láy. (Gạch chân, chỉ rõ câu rút gọn và từ láy). Câu trả lời của bạn
Lúc 7 giờ hai ôtô cùng khởi hành từ hai điểm A B cách nhau 96km và đi cùng chiều nhau. Vận tốc của xe đi từ A là 36km/h và của xe đi từ B là 28km/h. a. Lập phương trình chuyển động của hai xe trên cùng một trục tọa độ và lấy A làm gốc chiều dương từ A đến B. b. Tìm vị trí của hai xe và khoảng cách giữa chúng lúc 9 giờ. c. Xác định vị trí và thời điểm lúc hai xe gặp nhau.
21. Choosing to go under the ___ is very risky. Women these days are very fond of this way of improving appearance. * 1 điểm A. surgery B. knife C. operation D. weather 22. You’re getting on my ______ by constantly bothering me like that! * 1 điểm A. muscles B. brains C. nerves D. blood 23. Persuading my father to drive me to school is very easy, like taking ____ from a baby. * 1 điểm A. candy B. sweets C. cake D. biscuits 24. An act of physical force that causes or is intended to cause harm is called ____. * 1 điểm A. family B. violence C. health D. marriage 25. When my father caught me with a cigarette, he made me smoke the entire pack. I was ___ as a dog and I've never touched a cigarette ever since. * 1 điểm A. sick B. sad C. stupid D. stubborn
II. Chọn câu (ứng với A, B, C hoặc D) có nghĩa gần nhất với câu cho trước trong các câu từ 21 đến 23. Câu 21: That factory is producing more and more pollution. A. More and more pollution is being produced by that factory. B. Pollution is produced by that factory more and more. C. More and more pollution is produced by that factory. D. Pollution is producing by that factory more and more. Câu 22: “I am working in this company,” she said. A. She said that I am working in that company. B. She said that she was working in that company. C. She said that she is working in this company. D. She said that she was working in this company. Câu 23: It’s two years since Mai last wrote to me. A. Mai wasn’t written to me since two years. B. Mai didn’t wrote to me for two years. C. Mai hasn’t written to me for two years. D. Mai wouldn’t write to me since two years. III. Chọn từ/ cụm từ gạch dưới (ứng với A, B, C hoặc D) cần phải sửa trong các câu từ 24 đến 25. Câu 24: He used to coming late when he was a high school student. A B C D Câu 25: What did you do if you met an alien from outer space? A B C D IV. Đọc kỹ đoạn văn sau và chọn phương án trả lời đúng (ứng với A, B, C hoặc D) cho mỗi câu hỏi từ 26 đến 30. The large movement of earth under the water causes a very large and powerful tsunami. The tsunami was called the Asian Tsunami in most of the world. It was called the Boxing Day Tsunami in England, Australia, South Africa and Canada because it happened on the holiday they call Boxing Day. The tsunami caused a lot of damage to countries such as the Philippines, Thailand, Indonesia and Sri Lanka. Waves as high as 30m killed many people and damaged or destroyed a lot of buildings and other property. Over 225,000 people died or were not found after the tsunami. The wave traveled as far as South Africa (8000km) where as many as 8 people died because of high water caused by the wave. Because of how much damage was caused and the number of people the earthquake affected, over US$7 billion was donated to help the survivors and to rebuild the areas damaged. Câu 26: All of the following statements are true EXCEPT _________. A. A lot of money was raised to help people B. Only in Asia the tsunami called Asian Tsunami C. Many people died because of the high waves D. The tsunami caused a lot of damage to Indonesia Câu 27: What does the word ‘survivors’ in the passage mean? A. people who were dead B. houses which aren’t destroyed C. offices which are rebuilt D. people who are left alive Câu 28: How high were the waves? A. thirteen meters B. thirty meters C. two hundred and twenty five meters. D. eighteen meters Câu 29: Why was the tsunami called the Boxing Day Tsunami in England? A. Because it happened when people were boxing. B. Because it destroyed a lot of boxes. C. Because it happened when people were collecting boxes. D. Because it happened on Boxing Day.
Chọn phát biểu sai ? A. Trong trường hợp có thể bỏ qua tác dụng của lực cản không khí lên vật rơi thì ta có thể coi sự rơi của vật là sự rơi tự do. B. Chuyển động rơi tự do có gia tốc rơi tự do như nhau tại mọi nơi trên Trái đất. C. Sự rơi tự do là sự rơi chỉ dưới tác dụng của trọng lực. D. Chuyển động rơi tự do là chuyển động thẳng nhanh dần đều theo phương thẳng đứng chiều từ trên xuống.
2. Điền các từ đề bạt, đề cử, đề xuất, đề đạt vào chỗ trống cho phù họp vói nội đung: …. – trình bày ý kiến hoặc nguyện vọng lên cấp trên. …. -cử ai đó giữ chức vụ cao hơn. …. – giới thiệu ra để lựa chọn và bầu cử. …. – đưa vấn đề ra để xem xét và giải quyết. 3. Cho từ xanh a) Hãy đặt câu có từ xanh dùng vói nghĩa gốc. b) Hãy đặt câu có từ xanh dùng với nghĩa chuyển. 4. Trong các ví dụ sau, hiện tượng nào là đồng âm, hiện tượng nào là nhiều nghĩa? a) Mũi tên, mũi tẹt b) Chăn mây, chân trời c) Sợi mây, đám mây d) Sổ ba, ba mẹ
cho 8,4 gam Fe cháy trong bình chứa 3,36 lít khí O2 (ĐKTC), phản ứng tạo oxi sắt từ a,chất nào còn dư, dư bao nhiêu b,tính khối lượng oxi sắt từ thu được
16. My doctor gave me a(n) ____ for some medicine and advised me not to go out these days. * 1 điểm A. bill B. prescription C. appointment D. injection 17. Fathers and mothers who follow _______ have made a conscious decision to share equally in the raising of their children, household chores, breadwinning, and time for recreation. * 1 điểm A. equally shared parents B. equally shared parenting C. sharing equally parenting D. parentally equal shared 18. His improper behavior really turns my ____. * 1 điểm A. lung B. liver C. brain D. stomach 19. Her boyfriend is still too ____ to his mother's apron strings, he cannot lead an independent life. * 1 điểm A. chained B. joined C. connected D. tied 20. Food and drinks which strongly _________ the body can cause stress. * 1 điểm A. relate B. develop C. encourage D. stimulate
Giúp em lời giải với cách giải chi tiết vs ạ II. Chọn câu (ứng với A, B, C hoặc D) có nghĩa gần nhất với câu cho trước trong các câu từ 21 đến 23. Câu 21: That factory is producing more and more pollution. A. More and more pollution is being produced by that factory. B. Pollution is produced by that factory more and more. C. More and more pollution is produced by that factory. D. Pollution is producing by that factory more and more. Câu 22: “I am working in this company,” she said. A. She said that I am working in that company. B. She said that she was working in that company. C. She said that she is working in this company. D. She said that she was working in this company. Câu 23: It’s two years since Mai last wrote to me. A. Mai wasn’t written to me since two years. B. Mai didn’t wrote to me for two years. C. Mai hasn’t written to me for two years. D. Mai wouldn’t write to me since two years. III. Chọn từ/ cụm từ gạch dưới (ứng với A, B, C hoặc D) cần phải sửa trong các câu từ 24 đến 25. Câu 24: He used to coming late when he was a high school student. A B C D Câu 25: What did you do if you met an alien from outer space? A B C D IV. Đọc kỹ đoạn văn sau và chọn phương án trả lời đúng (ứng với A, B, C hoặc D) cho mỗi câu hỏi từ 26 đến 30. The large movement of earth under the water causes a very large and powerful tsunami. The tsunami was called the Asian Tsunami in most of the world. It was called the Boxing Day Tsunami in England, Australia, South Africa and Canada because it happened on the holiday they call Boxing Day. The tsunami caused a lot of damage to countries such as the Philippines, Thailand, Indonesia and Sri Lanka. Waves as high as 30m killed many people and damaged or destroyed a lot of buildings and other property. Over 225,000 people died or were not found after the tsunami. The wave traveled as far as South Africa (8000km) where as many as 8 people died because of high water caused by the wave. Because of how much damage was caused and the number of people the earthquake affected, over US$7 billion was donated to help the survivors and to rebuild the areas damaged. Câu 26: All of the following statements are true EXCEPT _________. A. A lot of money was raised to help people B. Only in Asia the tsunami called Asian Tsunami C. Many people died because of the high waves D. The tsunami caused a lot of damage to Indonesia Câu 27: What does the word ‘survivors’ in the passage mean? A. people who were dead B. houses which aren’t destroyed C. offices which are rebuilt D. people who are left alive Câu 28: How high were the waves? A. thirteen meters B. thirty meters C. two hundred and twenty five meters. D. eighteen meters Câu 29: Why was the tsunami called the Boxing Day Tsunami in England? A. Because it happened when people were boxing. B. Because it destroyed a lot of boxes. C. Because it happened when people were collecting boxes. D. Because it happened on Boxing Day.
11. The story concerns a woman who conceives a child out of ___ and is rejected by the baby's father. A. wedding B. marriage C. union D. wedlock 12. People are waiting for a _____ system with better doctors and facilities in this country. A. health care B. educational C. entertainment D. transportation 13. The ___ of brothers and sisters depends on their personalities. A. compatible B. incompatible C. compatibility D. incompatibility 14. My grandfather is always healthy and full of energy. He is ____. A. as sick as a dog B. as fit as a fiddle C. as pale as a ghost D. as sharp as a razor 15. Exerting control over an adult child's life is a sign of _______. A. reproductive health B. verbal abuse C. helicopter parenting D. foster family
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