Bài 2: Cho hệ phương trình: $\left \{ {{( m - 1 )x - my = 3m -1} \atop {2x -y = m + 5}} \right.$ a) Giải và biện luận hệ phương trình theo m b) Với giá trị nguyên nào của m để hai đường thẳng của hệ cắt nhau tại một điểm nằm trong góc phần tư thứ IV của hệ tọa độ Oxy

Hợp chất D biết 0.2 mol hợp chất D có chưa 9.2g Na 2.4g C và 9.6 g O

a, 3x + 2 chia hết cho 2x - 1 b, x^2 - 2x + 3 chia hết cho x - 1 Tìm x thuộc Z

Cho tam giác ABC cân tại A có BC = 24cm ,AC=20cm .Tính độ dài bán kính đường tròn tâm O nội tiết tam giác ABC

Tính diện tích xung quanh và diện tích toàn phần của hình hộp chữ nhật có chiều dài 8dm, chiều rộng 5dm,chiều cao 6dm. Các bạn giúp mình với

I. Find the word which has a different sound in the part underlined: 1.A. nice B.bicycle C. ride D. live 2. A. science B.like C. music D.ice 3. A.photo B.going C. mom D. home 4. A. fun B.student C. hungry D.sun 5. A. brother B.judo C. cold D. rode II. Choose the best answer A, B, C or D: 6. _________ is a kind of film making people laugh. A. documentary B. cartoon C. music D. comedy 7. Do you want to check the _________ ? A. remote control B. TV schedule C. newspaper D. volume button 8. I have a lot of homework, _________ I can't go out with you. A. because B. and C. but D. so 9. _________ Tom and Jerry is rather funny,she doesn't like watching that film. A. and B. but C. because D. although 10. ___________ hours a day do you watch television? A. How many B. How much C. When D. How often 11. ___________ is her favourite television MC? A. When B. Who C. What D. Where 12. ___________ do you go to Hanoi? – By car. A. How many B. How much C. How D. How often 13.VTV1is a ___________ television channel in Viet Nam. A. local B. international C. national D. multi- national 14. The news programme attracts millions of __________ at 7 p.m. A. newsreaders B. weatherman C. MC D. viewers 15. I want to watch the cartoon _________ it is funny and simple. A. but B. so C. although D. because III. Put the verbs in the correct form: 16. I ( meet ) __________ them at the movie theater last night. 17. He ( go ) __________ to English club two days ago. 18. She ( teach ) __________ at a village school last year? 19. They ( not / return ) __________ Ha Noi last week. 20. What ( the children / do ) __________ this morning ? 21. Where they ( live ) __________ in 2005 ? 22. The students ( not / be ) __________ here twenty five minutes ago. IV. Use the words in the box to fill the passage below: comedies educational national viewers VTV1 is a (23) ………...…….....……television channel in Viet Nam. It attracts millions of (24) ………………...…because it offers many different interesting programmes. The 7 o’clock news tells people what is happening in Viet Nam and the rest of the world. (25) …………................….. bring a lot of laughter and help people relax after a hard working day. The most exciting programmes are game shows. They can be both entertaining and (26) ……………….................... V. Read and choose true (T) or false (F): Television is a very popular mode of entertainment today. In most of the homes, we find the family members stuck to the Television watching intently the programmes showed. Today, even in India, Television stands as the cheapest mode of wholesome entertainment. It provides the viewer with a wide selec¬tion of channels and programmes with the help of the cable network now readily available. Sometimes this wide variety of programmes becomes the cause of an argument among family members as to which channel should be put on. Television is a good source of ad¬vertising for companies who want to promote their products. Day to day happenings and daily news is readily available on various channels. Reviews on various national events and live telecasts of sport events are also available. Thus, Television provides the viewer with entertainment and awareness. True or false. .................27. Today, television is not popular. .................28. Nowadays, we have TV cable net work. .................29. TV is a good source of advertising for companies. .................30. TV provides the viewer nothing . .................31. TV is the most expensive kind of entertainments. VI. Match the questions ( A ) and the answers ( B ): A B 32. Would you like to drink some tea ? a. Yes, sure. 33. What is she doing now ? b. I am speaking to my teacher. 34. Are they tall or short ? c. Yes, I'd love to. 35. Can you give me some water, please ? d. They go to school at 6. 30. 36. Where does he live ? e. She is watching TV . 37. When do the students go to school ? f. They are tall. 38. Who are you speaking to at the moment? g. He lives in Ha Noi. Answers: 32............33.............34...............35...............36...............37.................38............. VII. Make questions for the underlined words: 39-I am listening to music at the moment. 40-My mother lives in the country.

tìm các số nguyên X sao cho A)-7 là bội của X + 8 B)x-2 là ước của 3x-13

Tìm x:a)(4x-2)×(x+5) b)2x-9=-8-9

Giúp mình giải chi tiết với thank ,

Hợp chất C biết tỉ lệ khối lượng các nguyên tố: mCa:mN:mO = 10:7:24 và 0.2 mol hợp chất C nặng 32.8g