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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
53
管理
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。
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