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Câu 2 : Tìm x để x3 +2x2+x-1=x3-x2+3x-1 Giúp mk nhé ! Và tính hộ mk câu này nhé :
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BENEFITS OF VIDEO CONFERENCING Video conferencing is the technology that allows you to hold meetings with people who are in different places while seeing them and talking to them in real time. It is different from simple video calling, which is often one-to-one video communication. In the past, video conferencing needed complex and expensive equipment. Today, it's easy to join in a video conference on your computer or smart phone with Internet connectivity. Moreover, video conferencing is also an important tool for people who work away from the office, often at home because it helps to save time and money for them. Video conferencing can help teachers in teaching, too. Video conferencing is a great way of learning and sharing knowledge beyond distance. Courses can take place with the teacher and each different student living in a different location. This will help education spread even to remote mountainous areas. 7. Video conferencing helps people _____________. A. send message B. send snail mail C. send snail mail D. hold meetings 8. How does video conferencing help people? A. It helps connect people in different places in real time. B. It helps connect people in different places in future time. C. It helps connect people in same places in real time. D. It helps connect people in same places in future time. 9. What can people do with video conferencing? A. People can see and touch each other. B. People can see and use telepathy. C. People can see and talk to each other. D. People can talk and touch each other. 10. Which statement below is NOT TRUE? A. Video calling is often one-to-one communication B. Video conferencing can happen between many people. C. In the past, video conferencing needed simple equipment. D. Today, video conferencing only needs smartphone with Internet connectivity. 11. How can video conferencing help people who work away from the office? A. It saves time. B. It saves money. C. It saves time and money. D. None of them. 12. Who will get benefits from video conferencing? A. farmer B. teacher C. engineer D. housewife 13. What is the advantage of studying through video conferencing? A. Teacher can start class late. B. Teacher doesn't know his/her students. C. Teacher and students can be in same places. D. Teacher and students can be in different places. 14. What does the word "mountainous" mean? A. a place has rivers B. a poor place C. a place has mountains D. a far place

I. Read the following text and decide which answer best fits each numbered blank. Technology in education plays an important role (1) _____________ building on the educational skills and knowledge for people. This is very essential, especially those who need (2) _____________ their knowledge. (3)_____________ for them to achieve a successful life in the future. Technology in education is manifested through the use of computers. This is also a great help for teachers (4)_____________ they can already enhance their teaching skills and strategies every time they are facing their classes. There is a variety of benefits which technology brings back. Firstly, students can already learn (5) _____________ their own even without the (6) _____________ of their parents and teachers. 1. A. on B. in C. at D. for 2. A. improve B. improving C. to be improved D. being improved 3. A. so that B. in order C. so in D. in order that 4. A. although B. so C. because D. hence 5. A. for B. at C. on D. in 6. A. assist B. assistant C. assisting D. assistance

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