2012 AMC 12A 第 1 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。
1.
一只小虫沿着数轴爬行，从 出发。它先爬到 ，然后转身爬到 。这只小虫总共爬了多少单位？
A bug crawls along a number line, starting at It crawls to then turns around and crawls to How many units does the bug crawl altogether?
答案：E
小提示：
把两段爬行距离相加，而不是只看净位移
Add the two separate crawl distances rather than the net displacement
大提示：
第一段是 ，第二段是
The first leg is and the second is
解答：
小虫第一段爬了 个单位，第二段爬了 个单位。
总距离为 。
因此，正确答案是 E。
The bug crawls units on the first leg and units on the second leg.
The total distance is
Thus, the correct answer is E.
其他年份的第 1 题
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