2. 外语
  3. On a certain number line, if 8 is distance of 18 from n, and 17 is he distance of 9 from n, then which of the following could be

On a certain number line, if 8 is distance of 18 from n, and 17 is he distance of 9 from n, then which of the following could be

admin2021-05-18  67
问题 On a certain number line, if 8 is distance of 18 from n, and 17 is he distance of 9 from n, then which of the following could be n?
选项 A、-10
B、8
C、18
D、-18
E、26
答案E
解析 本题中我们首先需要注意8 is a distance of 18 from n，and 17 is the distance of 9 from n两句话的意思区别。8 is a distance of 18 from n，这句话中使用的是不定冠词a，表达的是8和n之间的距离是18，而不是18和n之间的距离是8；17 is the distance of 9 from n。这句话中使用的是定冠词the，就一个词的区别，表达完全不同的意思，即17是9和n之间的距离。根据题意得到：
|n-8|=18，得到n=-10 or n=26；
|n-9|=17，得到n=-8 or n=26；
所以n=26，E为正确答案。
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