Giải pt $\sqrt{-x^{2}-x-1} - \sqrt{2x^{2}+2x} = \sqrt{x^{2}+x+1}$

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Exercise 1: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 1. During his ​the family lived in Cornwall. A. child​B. childlike​C. childish​D. childhood 2. How many ​were there in all? A. compete​B. competitions​C. competitive​D.competitors 3. We won't buy the car until the ​arises. A. necessary​B. necessity​C. necessarily​D. unnecessary 4. ​waste is one of the causes of air pollution. A. Industrious​B. Industrial​C. industry​D.industrialization 5. Mount Vesurius is an ​volcano. A. act​B. active​C. action​D. activity 6. He is confident enough to express his opinion ​ A. comfortable​B. comfort​C. comfortably​D.uncomfortable 7. She is so busy with ​activities that she has no time forentertainment. A. society​B. social​C. sociable​D. socialization 8. One day, young Faraday attended a lecture given by a ​scientist, Sir Humphry Davy. A. famous​B. fame​C. famously​D. infamous 9. He has been very interested in doing research on ​since he was at high school. A. Biology​B. biological​C. biologist​D. biologically 10. You are old enough to take ​for what you have done. A. responsible​B. responsibility​C. responsibly​D.irresponsible Exercise 2: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 1. These quick and easy ​can be effective in the short term, but they have a cost. A. solve​B. solvable​C. solutions​D. solvability 2. He was looking at his parents ​, waiting for recommendations. A. obey​B. obedience​C. obedient​D. obediently  3. The interviews with parents showed that the vast majority were​of teachers. A. support​B. supportive​C. supporter​D. supporting 4. It is ​of you to leave the medicine where the children could reachit. A. care​B. caring​C. careless​D. careful 5. For ​reasons, passengers are requested not to leave any luggageunattended. A. secure​B. securely​C. security​D. securing 6. The leader of the explorers had the great ​in his native guide. A. confident​B. confidence​C. confidential D. confidentially 7. We are impressed by his ​to help us with the hard mission. A. will​B. willing​C. willingness​D. willingly 8. Although they are twins, they have almost the same appearance but they are seldom in ​ A. agree​B. agreeable​C. agreement​D. agreeably 9. The more ​and positive you look, the better you will feel. A. confide​B. confident​C. confidently​D. confidence 10. It is reported that humans are the main reason for most species'declines and habitat ​and degradation are the leading threats. A. destroy​B. destructive​C. destructor​D. destruction