Which of the following is equal tofor all integers x and y?

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问题 Which of the following is equal tofor all integers x and y?

选项 A、4-x
B、4-y
C、2xy
D、4x
E、4y

答案B

解析 Simplifying the fraction. The only answer choice with 2 as the base is Choice C, 2xy, which is clearly not the correct answer. Since all the other answer choices have 4 as the base, it is a good idea to rewrite 2-2y as an expression with 4 as the base, as follows.

Thus the correct answer is Choice B.
This explanation uses the following strategies.
Strategy 5: Simplify an Arithmetic or Algebraic Representation
Strategy 8: Search for a Mathematical Relationship
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本试题收录于: GRE QUANTITATIVE题库GRE分类
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