SAT I 一日一问:2014年5月23日

所属专题:出国留学  来源:    要点:SAT官方题目  
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The correct answer is E

Explanation

The inequality |x-5|<=2 is equivalent to negative 2 is less than or equal to (x minus 5) is less than or equal to 2. Adding 5 to each term of this inequality gives (negative 2 plus 5) is less than or equal to (x minus 5 plus 5) is less than or equal to (2 plus 5), which is equivalent to 3 is less than or equal to x is less than or equal to 7. There are five integers (3, 4, 5, 6 and 7) that satisfy this inequality, and so there are five integers that satisfy |x-5|<=2.

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