1972 AMC 12 第 10 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
10.
对实数 ，不等式 等价于：
For real, the inequality is equivalent to:
或
or
或
or
或
or
小提示：
上界表示 与 的距离不超过
The upper bound places within units of
大提示：
下界排除了与 距离小于 的开区间
The lower bound removes the open interval of points less than unit from
解答：
条件 给出 。条件 给出 或 。二者的交集为
因此，正确答案是 D。
The condition gives The condition gives or Their intersection is
Therefore, the correct answer is D.
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