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ngochamathi
2 năm trước
Cho phương trình: x 2 -2(m+1)x +m 2 +1 =0 a/ Giải phương trình m=-2 Tìm m để phương trình có một trong các nghiệm bằng -1 c/ Tìm m để phương trình có nghiệm kép.
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Câu 1 hệ pt 2x-y=1 tương đương vs hpt nào sau đây x+y=2 A 3x-=3 B 3x=3 C 3x=3 D 3x=3 x-y=2 x+y=2 2x+y=1 2x-y=3 Câu 2 hai hpt 3x-2y=3 và 3x-2y=3 tương đương khi x+y=2 x=y=2 A m=4 B m=3 C m=2 D m=1 Câu 3 nghiệm của hệ pt 2x+y=-1 là -2x+y=7 A x=-2 B x=3 C x=0,5 D x=-3 y=3 y=-2 y=0 y=1 Câu 4 hệ pt 0x+2y=4 có nghiệm là 3x-y-=7 A x=2 B x=3 C x ∈ R D x ∈R y=3 y=2 y=2 y=3x-7 Câu 5 cặp số nào sau đây là nghiệm của hpt 2x-y=1 4x-y=5 A (0;-1) B (1;-1) C (3;2) D (2;3) Câu 6 các hpt sau đây hpt nào có vô số nghiệm A x-3y=1 B x-3y=1 C x-3y=1 D 3x-9y=3 2x-2y=2 2x-6y=2 3x-3y=3 2x-2y=2 Câu 7 trong các hpt sau đây hpt nào vô nghiệm A x-3y=1 B x-3y=1 C x-3y=1 D 3x-3y=6 x-y=2 2x-6y=2 3x-3y=3 2x-2y=2 Câu 8 trong các hpt sau hpt nào có nghiệm duy nhất A 2x-y=1 B x-y=1 C 3x-3y=6 D x-3y=1 x-2y=5 3x-3y=3 2x-2y=2 2x-6y=2

Choose the word whose stressed pattern is pronounced differently from the others. A: addicted B: detest C: leisure D: community 2 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is people watching.” “_______” A: Sure. It’s very entertaining. B: OK. That’s very kind of you C: That’s all right. D: That sounds so weird! 3 Choose the best answer a, b, c or d to complete the sentence. Question 7. On YouTube you can find many videos on _______ all aspects of your English. A: improving B: taking C: surfing D: working 4 Choose the sentence so that it has similar meaning to the first one. Question 22. She likes to hang out with friends on Saturday evening. A: She’s interested in hang out with friends on Saturday evening. B: She’s fancy hanging out with friends on Saturday evening. C: She’s interested in hanging out with friends on Saturday evening. D: She’s keen in hanging out with friends on Saturday evening. 5 Choose the sentence so that it has similar meaning to the first one. Question 23. What leisure activity does she like most? A: What’s leisure activity does she like most? B: What’s her favorite activity in her free time? C: What does she like most? D: What activity does she like doing most? 6 Choose the word whose stressed pattern is pronounced differently from the others. A: teenager B: adore C: relax D: event 7 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. The word ‘it’ in paragraph 2 refers to ___________. A: the Internet B: computer C: IAS D: dream 8 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Internet addicts find it hard ___________. A: to use the Internet in the morning B: to spend more time on the Internet C: to spend less time on the Internet D: to lie about the time they spent online 9 Choose the best answer a, b, c or d to complete the sentence. Question 6. Daisy is _______ social media. She spends lots of time on Facebook and Instagram. A: bored with B: curious about C: tired of D: addicted to 10 Choose the sentence so that it has similar meaning to the first one. Question 24. How about going window-shopping this afternoon? A: Will we go window-shopping this afternoon? B: Shall we going window-shopping this afternoon? C: Shall we go window-shopping this afternoon? D: What about to go window-shopping this afternoon?

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