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Cho phương trình 8x^2-8x+m^2+1=0 (*) (x là ẩn số) Định m để phương trình (*) có hai nghiệm x1 , x2 thỏa điều kiện: x1^4 - x2^4 = x1^3 - x2^3 Giúp mình vs mình thật sự đang cần gấp lắm.
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Exercise 4: Read the passages and choose the correct answers. Patricia Denning stars in a sad movie about ambition and heartbreak. When Cecilia leaves college in Texas, she has everything: a wonderful boyfriend, Carl, an interesting job and an expensive house in a pretty town. Her life is perfect. Even her black Labrador dog, Perky, is a star: he wins the local dog competition and Hollywood wants to put him in a movie. Cecilia goes to Hollywood with him and leaves her boyfriend alone back home. When the studio fires Perky, Cecilia decides to stay in Hollywood and tries to get other movie roles for her beautiful dog. Carl gives Cecilia an ultimatum: come home and stop behaving crazily, or stay there forever. Cecilia decides to stay in Hollywood and wants to become an actress herself. She sends Perky back to Texas and starts an acting course. After six months, Cecilia realizes she can't act and she misses home, but it's too late. Carl has found another girlfriend. Cecilia tries to win him back, and also discovers a lot about herself on her long journey. This is a very sad movie, which makes you think about what we want from life. Patricia Denning is very convincing as Cecilia, but the star of the movie is gorgeous Perky, the black Labrador who steals our hearts. Black Hollywood is in cinemas from next week. 21. What does Cecilia not have? A. A house she loves B. A wonderful husband C. A pet D. A great job 22. When does her wonderful adventure begin? A. When her dog wins a competition B. When she marries her boyfriend, Carl C. When she goes on vacation to Hollywood D. When she buys the house in a pretty town 23. What happens to Perky in Hollywood? A. He isn't very successful B. He becomes a star C. He's too nervous to work D. He makes two movies and retires 24. What is Carl's reaction to Cecilia living in Hollywood? A. He doesn't know she went B. He's angry C. He doesn't care D. He's supportive 25. Why does Cecilia stay in Hollywood? A. She wants to become an actress B. She is too busy making movies C. She hates Carl D. She has no money

Exercise 3: Choose the correct answers. 11. ____ it rained, the boys played football. A. Despite B. Although C. However D. In spite of 12. _______ the traffic, I arrived on time. A. Although B. Despite C. Because D. Nevertheless 13. We watched TV the whole evening ______ we had nothing better to do. A. because B. although C. so D. but 14. ______ it was late, I decided to phone Brian. A. Despite B. However C. In spite of D. Although 15. ______ its cheap price, the car was in good condition. A. Although B. Despite C. In spite of D. B&C are correct. 16. There was a storm. _______, the ship could reach its destination on time. A. However B. In spite of C. Although D. Despite 17. He was offered the job ______ he had no experience. A. even though B. despite C. while D. however 18. Despite feeling cold, we kept walking. A. Although we felt cold, but we kept walking. B. Although we felt cold, we kept walking C. Despite we felt cold, we kept walking D. Although we feel cold, we kept walking 19. ______, he walked to the station. A. Despite being tired B. Although to be tired C. In spite being tired D. Despite tired 20. Although the film was hilarious, she didn’t laugh. A. Despite of the hilarious film, she didn’t laugh. B. Despite the hilarious film, she didn’t laugh. C. In spite of the film was hilarious, she didn’t laugh. D. Although she didn’t laugh, the film was hilarious.

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