Giải các phương trình a 2x(1-x) -6=5-(2x^2+3) b x^2/3-2x+1/2=x/6-x c 2/x+3+5/x-3=5x+3/x^2-9

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IV. Find the mistake then correct it. 1. The teacher ordered us not open our book until she told us to do so. 2. He is angry about having not been invited to her birthday party. 3. John was upset last night because he had to do too many homework. 4.We wish we have a longer vacation but we don’t 5. He doesn’t have any informations about the departure and arrival time of today’s flights. 6. I wish I didn’t go there for my holiday last year. I didn’t enjoy it. 7. The mother asked her son what did he want for his birthday. 8. Throughout the United States there is fast food restaurants where hamburgers are served. 9. Each of the students in the class has to do their own assignment this semester. 10. Helen was proud for finishing the work in such a short time. V. Fill in each gap one suitable preposition. Dear sir, I saw your advertisement (1)………………. English classes (2)………….. Sunflowers magazine and I am interested (3)…………. coming (4)…………….your Foreign Language Center this summer. I have learnt English (5)…………….. 2 years but I have never been (6)……….. England and I feel that it is now necessary, especially to improve my pronunciation. Could you please send me more information (7)…………. your courses and an application form? I would also like some information about accommodation. I can do your tests (8)………… attending your course if necessary. I look forward (9)…………. hearing (10)………… you as soon as possible. Your faithfully, J.B John. VI. Read the text then choose the best answer to fill in the blanks. LEARNING A SECOND LANGUAGE Some people learn a second language (1)_____. Other people have trouble learning a new language . How can you have (2)_____learn a new language , such as English ? There are several ways to make learning English a little (3)_____and more interesting . The first step is to feel positive about learning English . If you believe that you can learn,you will learn .(4)____patient.You do not to have to understand(5)____all at once . It `s natural to make mistakes when you learn something new . We can learn from our mistakes . The second step is to practice your English. For example , write in a journal, or diary ,every day. You will get used to (6)_____in English , and you will feel comfortable expressing your ideas in English . After several weeks, you will see that your writing is improving .(7)_____,you much speak English every day. You can practice with your classmates (8)_____class. The third step is to keep a record of your language learning . You can write this in your journal . After (9)_____class , think about what you did . Did you answer a question(10)_____? Did you understand something the teacher explained?Perhaps the lesson was difficult , but you tried to understand it . It is important to practice every day and make a record of your achievements . 1. A. ease B. easy C. easily D. all a, b, c. 2. A. itself B. yourself C. himself D. herself 3. A. ease B. easy C. easily D. easier 4. A. Be B. Being C. To be D. Been 5. A. anything B. nothing C. everything D. something 6. A. write B. writing C. to write D. written 7. A. In addition B. Addition C. Additional D. By addition 8. A. of side B. outside C. beside D. byside 9. A. some B. each C. all D. few 10. A. correct B. correction C. correctly D. corrective