~ Bạn tham khảo ~
Ta có :
`x:y:z=1:2:9`
`=> x/1=y/2=z/9`
Đặt `x/1=y/2=z/9=k`
`=> x=k;y=2k;z=9k`
Thay vào `P` ta có :
`P = [2k-2k+6(9k)]/[7k+2(2k)-3(9k)]`
`=> P = [54k]/[7k+4k-27k]`
`=> P = [54k]/[-16k]`
`=> P = -27/8`
Vậy `P=-27/8`
Đáp án + Giải thích các bước giải:
Ta có : `x:y:z=1:2:9=>x/1=y/2=z/9`
`=>{(x=k),(y=2k),(z=9k):}`
Do đó `P=(2x-y+6z)/(7x+2y-3z)`
`=(2k-2k+6*9k)/(7k+2*2k-3*9k)`
`=(54k)/(7k+4k-27k)`
`=(54k)/(-16k)=-54/16=-27/8`
Vậy `P = -27/8`.
Vẽ đậu mầm sad và đậu mầm funny NL: Nhóm nào còn slot ko cho mình vô nhé
I. Choose the word whose underlined part is pronounced differently from the others. 1. a. sound b. out c. found d. enough 2. a. bracelet b. favourite c. craft d. game 3. a. leisure b. sure c. shopping d. socialise 4. a. trick b. kit c. addict d. virtual 5. a. satisfied b. hooked c. bored d. socialised II. Choose the best answer a, b, c or d to complete the sentence. 1. How much time do you spend _______ leisure activities? a.on b. in c. for d. with 2. Why don’t you apply for this job? It looks right _______ your street. a.on b. in c.at d. up 3. Many young people don’t _______ walking to school or playing active games? a. prefer b. enjoy c. suggest d. want 4. Daisy is _______ social media. She spends lots of time on Facebook and Instagram. a.tired of b. bored with c. addicted to d. curious about 5. _______ leisure time is free from compulsory activities, it is often referred to as “free time.’ a. Because b. Although c. When d. As long ass 6. On YouTube you can find many videos on _______ all aspects of your English. a. surfing b. working C. taking d. improving 7. Some addicts are teenagers _______ are hooked on computer games. a. which b. who c. what d. whose 8. My sister enjoys _______. She usually walks around the mall, but not buying anything. a. going shopping b. hanging out c. window shopping d. doing DIY 9. You can raise a _______ pet like a Neopet if you aren’t allowed to own a real pet. a. domestic b. virtual c. weird d. beloved 10. “My favourite leisure activity is people watching.” “_______” a. That sounds so weird! b. That’s all right. c. OK. That’s what you’ve chosen. d. Sure. It’s very entertaining.
please pls pls pls quick quick please
semi lo lắng nhé ;-; honey lo quá!
III. Find one mistake and correct it 1. My brother lives on the city. 2. I go to the museum next week. 3. How much students are there in your class. 4. He raises cattle in his farm. 5. Hoang will has a birthday party next Sunday. 6. What does your sister work? – She’s a doctor. 7. That room is furnish. It has a bed, a lamp, a table and chairs. 8. What an awful weather! 9. Lan doesn’t have much friends in new school. 10. Hong’s birthday is in December 1st. 11. How old will Nam is on his next birthday? 12. What is a old car! 13. Would you like watching a movie?
Mong mọi người làm nhanh nhất có thể
Viết một đoạn văn đoạn văn biểu cảm ngắn khoảng 10 câu chủ đề tự chọn trong đó có sử dụng từ Hán Việt và chỉ rõ.
III. Correct a mistake 1. If I were you, I won't buy an expensive car for your son. 2. In order an object to be visible, light must travel from that object to a person’s eyes. 3. All of the films I’ve ever seen, this is the most interesting. 4. Pigeons, like many migratory birds, read the positions of the sun and stars so as to orient them. 5. The young emperor chick stands in front of one of its parents to protect from the cold. 6. Dreaming, like all other mental processes, it is a product of the brain and its activity. 7. I don’t know why is he interested in reading novels by this writer. 8. Each of the luxury cars in the showroom was quickly sold to their new owner. 9. In the long run, the future population growth of the world is difficult for predicting. 10. Though she has changed a lot, but you will have no difficulty recognizing her. Giúp mình với ạ ! Cảm ơn rất nhiềuuuuu
heldddddddddddd sắp bị lên thớt rùi cứu e với là ra giấy nhé e cám ơn
12. If she _______ the train last night, she _________ here now. A. took / were B. were taking / is C. had taken / would have been D. had taken / would be 13. _______ speaking, I do not really like my present job. A. Honest B. Honestly C. Honesty D. Dishonest 14. A letter of _______ is sometimes really necessary for you in a job interview. A. recommend B. recommended C. recommender D. recommendation 15. _______ if he comes late? A. What you would do B. What would you do C. What will you do D. What you will do
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến