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1, Tìm Min, Max A= $\frac{2 √x+1}{ √x+5}$ 2, Tìm x ∈ Z để A ∈ Z A= $\frac{2 √x-1}{3 √x+2}$
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21. He asked me to go _____ find his wallet in the office. A. or B. so C. and D. if 22. I prepared all the possible questions for the interview this morning; _____, I failed it. A. but B. however C. for D. instead 23. Skating is a good sport for players to keep fit. _____, it helps us to better control balance. A. When B. Additionally C. So D. But 24. _____ I’m watching a documentary on TV, my sister is cycling around the village with her friends. A. While B. Especially C. However D. Until 25. After the death of his parents, he never smiles _____ laughs. A. as B. or C. instead D. however 26. _____ her arms still hurt, she decided to stop playing volleyball for a month. A. Additionally B. However C. And D. As 27. She would pass that judo contest _____ she practiced regularly. A. but B. so C. until D. if 28. We couldn’t play badminton in this weather condition. _____, we could stay inside and watch some musical programs on TV. A. Instead B. While C. Or D. For 29. I love Western culture, _____ the Christmas Eve. A. however B. if C. especially D. but 30. _____, we got home at midnight. A. For B. As C. Finally D. While 31. You should stay at home _____ the storm blows over. A. while B. additionally C. or D. until 32. _____ the teacher had gone, the students started to make noise and run around the class. A. If B. Immediately C. For D. However 33. _____, where do you think we should take the children to? A. So Vậy B. While C. Instead D. Until 34. There are people without homes, jobs _____ family. A. and B. or C. however D. for 35. We stopped _____ bought some food for lunch today. A. and B. if C. so D. but 36. I will try to wrap my gifts _____ asking for your help. A. finally B. instead of C. for D. while 37. _____, we decided to go to the pictures on Sunday morning. A. Because B. If C. While D. Finally 38. Tonight, my brother has to do the dishes _____ I made the bed for him this morning. A. so B. but C. instead D. as 39. Remember not to talk _____ you’re eating. A. or B. until C. while D. so 40. She will become more well-known _____ her latest film can get more viewers. A. instead B. while C. if D. and

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