2. 职称英语
  3. If x and y are different prime numbers, each greater than 2, which of the follow

If x and y are different prime numbers, each greater than 2, which of the follow

游客2024-01-12  32
问题 If x and y are different prime numbers, each greater than 2, which of the following must be true?
Ⅰ. x+y ≠91
Ⅱ. x-y is an even integer.
Ⅲ. x/y is not an integer.
选项 A、Ⅱ only
B、Ⅰ and Ⅱ only
C、Ⅰ and Ⅲ only
D、Ⅱ and Ⅲ only
E、Ⅰ, Ⅱ and Ⅲ
答案 E
解析 x，y都是大于2的质数，那么x，y必然都是奇数，所以两者之和必然为偶数，那么Ⅰ正确，两者之差也是偶数，Ⅱ正确，而由于x，y互质，x/y必然不是整数。因此E为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3355020.html
相关试题推荐
随机试题
最新回复(0)