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problems practice phần 8

Tham khảo tài liệu 'problems practice phần 8', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | a Less than 32 cents. b Less than 48 cents. c Less than 96 cents. d More than 48 cents. e More than 96 cents. 24. A B and C are three sequential integers that follow the rules ABC 0 and A B C. Which of the following might be true a A -3. b B C2 A - B. c B2A C2 B-A . d AB 0. e AB 2C 1. 25. If X-Y is positive X and Y have the same sign. Which of the following must be true a X2 Y2. b Y2 XY. c 1 Y 1 X. d 1 Y2 1 X2. e XY 0. 26. Z is a negative even number. Which of the following is the greatest fix a Zz-1. b Z2 z-1 . c Z2 z-1 d Zz. e 3Zz. 27. If -1 X 0 which of the following is the smallest a X3. b -X3. c 1 X. d 1 X-3 -3. e 1 X-4 -3. 28. A 0.5 and B 0.25. Which of the following must be true a A2 B2. b A B2 0.75. c A B 1. d A2B2 1. e 2B A. 29. Which of the following is equivalent to X X 3 5 a -5 X 3 b -4 X 1 c X -3 d X 1 e X -1 30. If X2 1 Y which of the following might be true a If X 0 then 1 X Y. b If X 0 then 1 X Y. c If Y 0 then X 0. d If Y 0 then X 0. e If X Y then Y 1. 31. 1 3 A 6 7 and 0.5 B 8 5. Which of the following might be AB a b c d e 1 . 1 2 5. . 1 6. 1 8. 32. If X 1. Which of the following is the greatest a 1 X 4. b 1 x -2. c 1 X - X2. d X-6 X-3 X4 -0.5 -X. e X . 33. A ship can carry a cargo of 25.5 tons and have a room for no more than 17 containers. What is the weight of each container if all the containers are equal a Less than 1.5 tons. b Less than 2 tons. c Exactly 2.5 tons. d More than 1.5 tons. e More than 2 tons. 34. The phrase 1- A-1B is negative only if a A 0 and B 0. b B A and AB 0. c B-1 A and AB 0. d A B 1. e AB 1. 35. Which of the following fit the rule V9X - 20 X a X 0. b X 0. c X 5. d X 0. e X 20 9 36. If A3 B3 what must be true a A2 B2. b AB 0. c A2 B3. d B3 A2. e A B. 37. The phrase A B 2 2AB is true only for a AB 0. b AB 0. c A B 0. d Any A and B. e Never. 38. If 1 X 1 and 1 Y -1 which of the following must be true when Y is an integer a Y2 - X-1 0. b Y2 X2. c Y3 X3 0. d 1 XY 1 X 1 Y. e Y X