`x^4+23x^3+x^2-46x-6`
`=x^4-2x^2+23x^3-46x+3x^2-6`
`=x^2(x^2−2)+23x(x^2−2)+3(x^2−2)``=(x^2−2)(x^2+23x+3).`
$x^4+2x^3+x^2-46x-6$
$=x(x^3+2x^2+x-46)-6$
ko dùng máy tính hãy so sánh A=10^2016+2017/10^2017+2018 và B=10^2017+2018/10^2018+2018 2018
Chủ đề trải nghiệm sáng tạo: nếu tôi là hiệu trưởng - Thế nào là ngôi trường mơ ước - Nếu được chọn làm hiệu trưởng ngôi trường ấy em sẽ làm gì? Vì sao em chọn điều đó? - Em sẽ làm gì để dự định đó thành sự thật ( nhớ tl hết giùm em nha, em cảm ơn nhiều ạ)
Mọi người giúp em với, em cần gấp lắm ạ I. Complete the second sentence so that it has the similar meaning to the first one. 1. Many people now speak English as a second or foreign language. For many people, English is not__________________________________________ 2. Most husbands didn't do any housework in the past. Nowadays, most of them often share housework with their wives. Most husbands_______________________________________________________ 3. I’m going to attend a summer camp next week. I plan_______________________________________________________________ 4. The child doesn’t talk to you because you look serious. The child would______________________________________________________ 5. Tourists throw trash in the places they come to, which will make the places polluted. If__________________________________________________________________ 6. They will have to repaint the house. The house___________________________________________________________ 7. More families will use dish washers in the corning years. Dish washers_________________________________________________________ 8. By the end of this week, my father will have bought a new vacuum cleaner as a gift for my mother. By the end of this week, a new vacuum cleaner______________________________ 9. It takes a long time to leam a foreign language. We spend___________________________________________________________ 10. In spite of her dream to become a singer, her parents force her to study Economics. Although____________________________________________________________ 11. This is the first time he goes abroad. He hasn’t___________________________________________________________ 12. Can’t you find a better hotel? Is this _____________________________________________? 13. You are not permitted to smoke in the main hall. Smoking is__________________________________________________________ 14. The last time she had a break was 2 years ago. She hasn’t___________________________________________________________ 15. "How about going to the cinema tonight?", said Tom. Tom suggested_______________________________________________________ 16. Five students will be awarded a present. Their test results are excellent. Five________________________________________________________________ 17. Although Nam is very good with numbers, I still think that he is not suitable for a job as an accountant. In spite of the fact that__________________________________________________ 18. Working as a salesman for this company might give you a lot of chances to travel abroad. lf you_______________________________________________________________ 19. In the past, students only learned what teachers provided them. Nowadays, students are expected to self-study a lot. Students_____________________________________________________________ 20. "Why don't we share the cost of the tour?" said my friend. My friend suggested___________________________________________________ 21. Although he couldn't draw beautifully, he still wanted to become an artist. Despite_____________________________________________________________ 22. My grandfather is 73 years old now. He does exercise every day to keep fit. My grandfather_______________________________________________________ 23. I didn’t pass the exam. Lack of practice is the reason for that. Lack_______________________________________________________________ 24. I went to the zoo last week and that is where I saw a real tiger for the first time. Before I_____________________________________________________________ 25. Everyone heard about your trip before I did. I was the____________________________________________________________ 26. I work in this building. This building is the tallest one in the city. The building_________________________________________________________ 27. She is still not satisfied with her husband even though he fully supports her in doing housework. In spite of___________________________________________________________ 28. Although her height is limited, she wishes to become a famous model. Despite_____________________________________________________________ 29. Working long hours or working overtime is not a problem to him. He doesn't___________________________________________________________ 30. Alice made a mistake in her homework. She remembered it. Alice remembered_____________________________________________________
Từ M nằm ngoài (O) vẽ 2 tiếp tuyến MP,MQ và cát tuyến MAB.Gọi I là trung điểm AB a,CM tg PIOQ nội tiếp b,PQ cắt AB tại E.CM MP^2=ME.MI c,Qua A kẻ đường thẳng song song với MP cắt PQ,PB lần lượt tại H và K Cm KB=2HI GIÚP MÌNH CÂU C VỚI
Cho 0,94 gam hỗn hợp hai andehit đơn chức no kế tiếp nhau trong dãy đồng đẳng cho tác dụng hết với dung dịch AgNO3/NH3 thu được 3,24 gam Ag . Xác định công thức phân tử hai andehit và tính % khối lượng của chúng .
Nhận biết các dd mất nhãn: 1. H2SO4, HCl, NaOH, Na2SO4, HNO3 2. K2SO3, K2SO4, K2S, KNO3 3.H2S, H2SO4, HNO3, HCl
Cho 12g hỗn hợp Al và Mg vào dung dịch H2SO4 98% dư , đun nóng thu được 14,56lit khí (đktc ) và dung dịch X . A. Tính thành phần phần trăm khối lượng của mỗi kim loại trong hỗn hợp. B. Để tác dụng hoàn toàn các chất có trong dung dịch X cần có 1 lít dung dịch NaOH 1,9M. Tính khối lượng dung dịch H2SO4 ban đầu
Cho 12,8 gam hỗn hợp hai kim loại Ag, Al tác dụng với Vml dung dịch H2SO4 loãng thu được 6,72 lít khí H2(đktc) a. Tính thành phần phần trăm mỗi kim loại ban đầu. b. Tính khối lượng muối thu được. c. Tính thể tích dung dịch H2SO4 3M đã phản ứng.
Em hơ đôi tay trên que diêm sáng rực như than hồng. Chà ! Ánh sáng kỳ diệu làm sao ! Em tưởng chừng như đang ngồi trước một lò sưởi bằng sắt có những hình nổi bằng đồng bóng nhoáng. Trong lò, lửa cháy nom đến vui mắt và tỏa ra hơi nóng dịu dàng. Thật là dễ chịu ! Đôi bàn tay em hơ trên ngọn lửa; bên tay cầm diêm, cái ngón cái nóng bỏng lên. Chà ! Khi tuyết phủ kín mặt đất, gió bấc thổi vun vút mà được ngồi hàng giờ như thế, trong đêm đông rét buốt, trước một lò sưởi, thì khoái biết bao! CÂU 1 Hãy chỉ ra trạng ngữ có trong đoạn văn chúng bổ sung ý nghĩa gì trong câu ? Câu 2 Chỉ ra câu đặc biệt có trong đoạnn văn và nêu tác dụng Câu 3 Đặc câu chỉ mục đích nguyên nhân mục đích các cậu cứu mình với ạ :(
Mọi người giúp em với, em cần gấp lắm ạ II. Give the correct form of the words in the brackets in each of the following sentences. 1. She prefers a book written only in English to a ________ one. (lingual) 2. People who are interested in exploring new things always want to take ________ trips. (adventure) 3. If you are a/an ________ person, you cannot become a good teacher. (patience) 4. My sister is really happy with her new job because of its high salary and ________. (flexible) 5. Although his job is quite good, he still wants to look for another job which provides him more ________ opportunities. (promote) 6. My 8-year-old brother wishes to become an excellent computer ________ when he grows up. (program) 7. Lan made all of us surprised when she said that she would become a ________. (poem) 8. The variety of dialects and accents in English is one of the biggest challenges to ________ English speakers. (native) 9. My close friend's grandfather is a famous scholar in linguistic field. He is very ________. (knowledge) 10. She ________ the word, so her foreign friend couldn't understand what she meant. (pronounce) 11. In most of the ________ companies, employees are required to use English competently. (nation) 12. Peter has still been ________ for over the past 6 months. I hope that he will soon find a job. (employ) 13. It is good that youngsters nowadays become more and more ________ in not only their thinking but also their behaviours. (depend) 14. Astronomy is the science that studies the ________ and its objects such as the moon, the sun, planets and stars. (universal) 15. In my family, my mother is the person who mainly provides ________ support to the whole family. (finance) 16. Parents who are ________for their families will not make their children happy. (responsible) 17. The increasingly high ________ rates in the last six months have worried the government. (employ) 18. When the students learn about space travel, they are very curious about the state of being ________. (weight) 19. Women in the 21st century are proving their ________ roles in both families and society. (act) 20. My sister is the worst cook in the world. What she cooks is either undercooked or ________. (cook) 21. It is very interesting to work as a researcher who carries out significant ________ research to benefit people's life. (science) 22. If you are going to Son Doong Cave, you really need to book a ________ tour because you will easily get lost there. (guide) 23. My cousin, who is 26 years old now, is ________. He is running a small business in traditional crafts. (employ) 24. It is a ________ that students must have at least 6.0 IELTS to take part in that English speaking contest. (require) 25. Although she was ________ in marketing field, she still applied for that marketing company. (experience) 26. Excessive consumption of fast food increases the risk of ________. (obese) 27. In this new teaching approach, teachers become ________ to support students' active learning. (facilitate) 28. After leaving high school, he wants to be trained as a ________ athlete instead of going to university. (profession) 29. He has completed three English courses at this center, but there hasn't been any ________ in his English level. (improve) 30. In some Asian countries such as India, Pakistan, the Philippines and Singapore, English is used as the ________ language. (office)
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