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An integer c is a common divisor of two integers x and y if

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An integer c is a common divisor of two integers x and y if and only if c is a divisor of x and c is a divisor of y.Which of the following sets of integers could possibly be the set of all common divisors of two integers?A.{-6,-2,-1,1,2,6}B.{-6,-2,-1,0,1,2,6}C.{-6,-3,-2,-1,1,2,3,6}D.{-6,-3,-2,-1,0,1,2,3,6}E.{-6,-4,-3,-2,-1,1,2,3,4,6}看懂是问公因数问题 ,但是不知道答案为什么是C...前辈们指导下
An integer c is a common divisor of two integers x and y if
首先不能有0,去掉答案B和D.根据题目给出的答案选项看,如果6是正确的,则分解为±1,2,3,6.A少3,E多4.
If x and y are integers whose least common multiple is a per If T is the set of even integers and S is the set of integer 1.If x is an integer greater than 1 and if y = x + 1/x,which 1．　If　x　and　y　are　integers　and　xy＋x＾2　is　oddh　which　of　the　f If positive integer x is a multiple of 6 and positive intege 一道看不懂的英文题1.If 2x < 100 and x is an integer,how many of the 2 if y is an integer ,then the least possible value of /23-5y/ if "X" is an integer,which of the following will produce an Find all integers x such that 2x^2+x-6 is a positive integer 【GRE数学】If x is an odd integer,for which of the following equ if y is a integer,then the least possible value of |23-5y|is If 4 per cent of (p+q)is 8 and p is a positive integer,what