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trandoanpb01
2 năm trước
: Cho hai đa thức: M(x) = 2x(x – 3) – 5(x – 2) + 3x^3 N(x) = - x(x + 1) – ( 3x – 4) + x^2(2x-3) (2x – 3) a) Thu gọn các đa thức trên. b) Tính : P(x) = 2 M(x) + N(x) . c) Xét xem x = -1 có là nghiệm của Q(x) = M(x) – N(x) không ?
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B. Read the passage carefully, then choose the correct answers. Having a best friend to confide in can bring a positive effect on our emotional health. An evening out with the closest friend may be the best guarantee of a good time. In fact, our best friend can prevent us from developing serious psychological problems such as depression and anxiety. Best friendship evolves with time - we cannot go out and pick our best friend. We become friends with people who share common interests – at school or through hobbies, for example. Best friends have usually known each other for years and stuck together through good and bad times. If you haven't got one, perhaps you are being too distant from people, or focusing too much on your work. 41. A best friend can ______. a. give us a healthy life b. go out with us in the evening c. spend much time finding d. share joy and sadness with us 42. Close friends need to ______. a. study at the same school b. have the same interests c. pursue the same hobbies d. spend time together 43. According to the passage, ______. a. it takes a lot of time to make close friendships b. we can go out and choose a good friend easily c. best friends have good and bad times d. It’s very difficult to make lasting friendships 44. The word 'one' in the last paragraph refers to ______. a. good time b. bad time c. a friendship d. a close friend 45. Which of the following sentences is not mentioned? a. We often have satisfaction being with a close friend. b. the ties of close friendship will never be broken. c. An unsociable person may not have a close friend. d. Friendships need time to develop

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