Giải pt $\sqrt{-x^{2}-x-1} - \sqrt{2x^{2}+2x} = \sqrt{x^{2}+x+1}$

Hòa tan 1 oxit kim loại có hóa trị 2 bằng một lượng vừa đủ h2so4 24,5% thu được muối A có nồng độ 33.33%. Xác định cthh của oxit kim loại

vẽ chữ cho mình như trong ảnh chữ: TRIỆU LỆ DĨNH 60 đỉm vẽ cho có tâm

To be honest, I ________(doubt) whether Jim will be here next week

Match 1.go to a. the ancestors 2. marry b. the pagoda 3.ask c. the festival 4.continue d. an interesting film 5.worship e. a lot of fruit 6.hold f. a rich man 7. keep g. the boat race 8.watch h. a show 9.perform i. some questions 10.buy j. the family tradition

Bài 4: Xác định chủ ngữ, vị ngữ, trạng ngữ trong câu sau 1. Qua khe dậu, ló ra mấy quả đỏ chói. 2. Những tàu lá chuối vàng ối xoã xuống như những đuôi áo, vạt áo. 3. Ngày qua, trong sương thu ẩm ướt vào mưa rây bụi mùa đông, những chùm hoa khép miệng bắt đầu kết trái. 4. Sự sống cứ tiếp tục trong âm thầm, hoa thảo quả nảy dưới gốc gây kín đáo và lặng lẽ. 5. Đảo xa tím pha hồng. 6. Rồi thì cả một bãi vông lại bừng lên, đỏ gay đỏ gắt suốt cả tháng tư. 7. Dưới bóng tre của ngàn xưa, thấp thoáng một mái chùa cổ kính. 8. Hoa móng rồng bụ bẫm như mùi mít chín ở góc vườn nhà ông Tuyên. 9. Sông có thể cạn, núi có thể mòn, song chân lí đó không bao giờ thay đổi.Thêm bài này nữa. Giải giúp mình nhé

1. He (be)…………. at his computer for seven hours. 2. She (not/have) ……………any fun a long time. 3. My father (not/ play)……….. any sport since last year. 4. I’d better have a shower. I (not/have)………. one since Thursday. 5. I don’t live with my family now and we (not/see)…………. each other for five years. 6. I…… just (realize)…………... that there are only four weeks to the end of term. 7. She (finish) ... reading two books this week. 8. How long…….. (you/know)………. each other? 9. ……….(You/ take)………… many photographs? 10. He (eat)………………. at the King Power Hotel yet? 11. They (live) ………….here all their life. 12 . She ( brush ) ……….her teeth after meals 13 . They ( play ) …… games after school . 14 . My mother ( work ) ………. in a factory . 15 . Lan’s brother ( go) ………. to bed at 10 o’clock . 16. I (not/go) ________ to work last week. 17. I always (meet) _____________ her on Tuesday. 18. Last year I (buy) _______ a new car. 19. your teacher (teach) this lesson two years ago? 20. He (sleep) ______badly last night. 21. His son (not write) ______a letter for him once a week. 22. He (receive) ______ a letter from his friends yesterday? 23.They never (drink) ____all the wine at the party ? 24. She (not/lend) _____you enough money? 25. He (be) __sent in prison last month.

Exercise 1: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 1. During his ​the family lived in Cornwall. A. child​B. childlike​C. childish​D. childhood 2. How many ​were there in all? A. compete​B. competitions​C. competitive​D.competitors 3. We won't buy the car until the ​arises. A. necessary​B. necessity​C. necessarily​D. unnecessary 4. ​waste is one of the causes of air pollution. A. Industrious​B. Industrial​C. industry​D.industrialization 5. Mount Vesurius is an ​volcano. A. act​B. active​C. action​D. activity 6. He is confident enough to express his opinion ​ A. comfortable​B. comfort​C. comfortably​D.uncomfortable 7. She is so busy with ​activities that she has no time forentertainment. A. society​B. social​C. sociable​D. socialization 8. One day, young Faraday attended a lecture given by a ​scientist, Sir Humphry Davy. A. famous​B. fame​C. famously​D. infamous 9. He has been very interested in doing research on ​since he was at high school. A. Biology​B. biological​C. biologist​D. biologically 10. You are old enough to take ​for what you have done. A. responsible​B. responsibility​C. responsibly​D.irresponsible  Exercise 2: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 1. These quick and easy ​can be effective in the short term, but they have a cost. A. solve​B. solvable​C. solutions​D. solvability 2. He was looking at his parents ​, waiting for recommendations. A. obey​B. obedience​C. obedient​D. obediently  3. The interviews with parents showed that the vast majority were​of teachers. A. support​B. supportive​C. supporter​D. supporting 4. It is ​of you to leave the medicine where the children could reachit. A. care​B. caring​C. careless​D. careful 5. For ​reasons, passengers are requested not to leave any luggageunattended. A. secure​B. securely​C. security​D. securing 6. The leader of the explorers had the great ​in his native guide. A. confident​B. confidence​C. confidential D. confidentially 7. We are impressed by his ​to help us with the hard mission. A. will​B. willing​C. willingness​D. willingly 8. Although they are twins, they have almost the same appearance but they are seldom in ​ A. agree​B. agreeable​C. agreement​D. agreeably 9. The more ​and positive you look, the better you will feel. A. confide​B. confident​C. confidently​D. confidence 10. It is reported that humans are the main reason for most species'declines and habitat ​and degradation are the leading threats. A. destroy​B. destructive​C. destructor​D. destruction

BÀI 1) Cho số có 4 chữ số . Nếu ta xóa đi chữ số hàng chục và hàng đơn vị thì số đó giảm đi 4455 đơn vị. tìm số đó? BÀI 2) một phép chia có thương là 6 và số dư là 3. tổng của số bị chia, số chia và số dư là 195. tìm số bị chia và số chia?

Giải pt $\sqrt{2x^{2}-1} + \sqrt{2x-1} = \sqrt{2x^{2}+2}$