tailieunhanh - Quantitative comparisons practice phần 3

Tham khảo tài liệu 'quantitative comparisons practice phần 3', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 19. A Ik 1A213 k 3 J 1A5 B 111 k 3 J The best answer is B. The power of 1 3 in column A is 6 while in column B its 5 and we know that dealing with fractions the smallest the power the largest the expression and so column B is greater. 20. A X2 B Y X AI X2Y3 0 XY 0. The best answer is A. From X2Y3 0 we know that Y is positive and using the data that XY 0 we can conclude that X is negative. The expression in column A is positive. The expression in column B is negative and so column A is greater. C. Absolute value 21. A lXl Y B X Y AI X 0 Y 1 The best answer is A. Plug in numbers that fit for example X -1 and Y . Column A and column B and so column A is greater. 22. A V - 7 B 7 - r AI Y -2 The best answer is C. The easiest way is to plug some numbers. For example Y -4. Column A 11 and column B 11 and so both columns are equal. 23. A T - 7 B 7 T AI Y -7 The best answer is C. The easiest way is to plug some numbers. For example Y -8. Column A 15 and column B 1 and so column A is greater. 24. A Y - 4 B y - 7 AI Y X 0 The best answer is B. The easiest way is to plug in numbers. For example X -1 and Y -2. Column A 6 and column B 9 and so column B is greater. 25. A ã 5 B R 5 AI R 0 The best answer is D. Take R -5 both columns end up zero. Take R -10 column A is greater and so the answer cannot be determined. 26. A s 3 B S 3 AI S -3 The best answer is A. Take a representative number for example S -5. Column A 2 and column B -2 and therefore column A is greater. 27. A Z -17 B Z - 17 AI Z 17 The best answer is C. Both expressions will always be positive and so the absolute value has no meaning. Both columns are equal. 28. A X y B 12 AI Y2 12 X2 3 The best answer is B. From the additional data we can conclude that Y 12 and X A3. The expression in column A 736 6 and therefore column B is greater. 29. A 1 B X AI 32 2X 21 X The best answer is A. Simplify the expression 32 2X 2X 25 X 2X 5 X x . Plug in X 1 we can see that the inequality is wrong and so X must be smaller than 1.

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