Tìm tất cả giá trị của tham số m để các bất phương trình sau nghiệm đúng với mọi x thuộc R a) -1 ≤x ²+5x+m/2x ²-3x+2<7

Mọi người giúp mình bài 4 bài 7 bài 8

Bài 2. Tìm các giá trị của m, a và b để các cặp phương trình sau đây tương đương: a. mx2 – (m + 1)x + 1 = 0 và (x – 1)(2x – 1) = 0 b. (x – 3)(ax + 2) = 0 và (2x + b)(x + 1) = 0

Có 3 viên bi nhìn bề ngoài giống hệt nhau trong đó có 1 viên bằng chì, 2 viên bằng sắt hãy chứng minh rằng chỉ cần dùng cân Rô-béc-van cân một lần duy nhất có thể tìm ra viên bi bằng chì

Hòa tan hoàn toàn hỗn hợp gồm 3,6 gam Mg và 6,75 gam Al bằng dung dịch H2SO4 đặc nóng thì thu được hỗn hợp 2 muối, V lít khí khí SO2 (đktc) và nước. a. Viết phương trình và tìm V b. Tính khối lượng muối thu được sau phản ứng

Gấppp..Bạn nào ơi làm giúp mình với. Tí phải nộp r mà mình kh làm đk 🤒

1.I/glad/able/ I/ were / am/to/ come/that/you. 2. Everybody / important / feel/it's/ should / that/ comfortable. 3. She/ surprised/ am/ hasn't/ I/ that/ phoned 4. We/ that/ never/ he # giúp e vs ah.Cảm ơn mn rất nhiều

4,9 < X < 5,1 Tìm 3 giá trị của X Thank you

(((1-x\sqrt(x)))/(1-\sqrt(x))+\sqrt(x))*(((1+x\sqrt(x)))/(1+\sqrt(x))-\sqrt(x))

Exercise 5. Write the second sentence so that it has the same meaning as the first one. Use the word in brackets. 1. I’m leaving now because I don’t want to miss the train. (so) I’m____________________________________________________________________ 2. The last time I saw my uncle was two years ago. (for)  I haven’t_______________________________________________________________ 3. Let me reach my office and then I will talk to him. (when)  I_____________________________________________________________________ 4. Why don’t we donate our old books, toys and clothes to charity? (suggests)  Mom_________________________________________________________________ 5. Jane stayed behind after the class in order to talk to the teacher. (because)  Jane__________________________________________________________________ 6. Where do you live? (address)  What _______________________________________________________________? 7. How old is she? (age) What _______________________________________________________________? 8. What time will it start? (start) When _______________________________________________________________? 9. Mr. Brown is not free this afternoon. (be) Mr. Brown ____________________________________________________________. 10.What does his sister do? (job) What ________________________________________________________________? Exercise 6. Read the passage then answer the questions below: Her name is Linda. She works in a large company in Ho Chi Minh City. She is a secretary. She answers the telephone and takes messages. She also uses a fax machine and a computer. She has to speak English with her boss. She starts work at 8:00. She usually rides her motorbike to work. She has lunch at 12:00. She finishes work at 5:30 pm. She goes home and helps her mother prepare dinner. After dinner she often watches television for a while and reads books. She usually goes to bed at 11:00pm. Questions: 1.Where does Linda work?  ______________________________________________________________ 2. What does she do?  ______________________________________________________________ 3. What language does she speak with her boss?  ______________________________________________________________ 4. Can she use a computer?  ______________________________________________________________ 5. How does she go to work?  ______________________________________________________________ …………THE END………….