2. 外语
  3. The solution set of which of the following inequalities is graphed on the number line shown?

The solution set of which of the following inequalities is graphed on the number line shown?

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问题
The solution set of which of the following inequalities is graphed on the number line shown?
选项 A、|x|≤12
B、2≤|x|≤12
C、|x-2|≤10
D、|x+7|≤5
E、|x-7|≤5
答案D
解析 把不等式直接表示在数轴上。如|x-a|≤b表示中心为a，线段两端到a的距离都为b。题图中线段中心为-7，线段两端到中心距离为5，故不等式为|x+7|≤5。故答案为D。
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