Question

一只小虫在数轴上从 $-2$ 爬到 $-6$ ，再爬到 $5$ 。它总共爬了多少距离？

A bug crawls along a number line, starting at $-2.$ It crawls to $-6,$ then turns around and crawls to $5.$ How many units does the bug crawl altogether?

$9$

$11$

$13$

$14$

$15$

答案：E

知识点：绝对值

难度评级：560

解答：

从 $-2$ 到 $-6$ 的距离为然后，从 $-6$ 到 $5$ 的距离为 $|-2 - (-6)| = |4| = 4$ $|-6 - 5| = |-11| = 11$

总距离为 $4 + 11 = 15.$

所以正确答案是 E。

It crawls a distance of $|-2 - (-6)| = |4| = 4$ when it moves from $-2$ to $-6.$ It then travels a distance of $|-6 - 5| = |-11| = 11$ as it moves from $-6$ to $5.$

The total distance is then $4 + 11 = 15.$

Thus, E is the correct answer.

2012 AMC 10A 第 3 题

答案：E

难度评级：560

解答：

其他年份的第 3 题