If x is an integer and y = 3x + 2 which of the following CANNOT be a divisor of y ?
4
5
6
7
8
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y不能是3的倍数。所以y一定也不是6的倍数。
Although 3x is always divisible by 3, image cannot be divisible by 3 since 2 is not divisible by 3. Thus, image cannot be divisible by any multiple of 3, including 6.
使用了代入法，不过此类题目真正的解法是什么？If x is an integer and y = 4x + 3 which of the following CANNOT be a divisor of y ?是一类吗？
考点是什么？
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y不能是3的倍数。所以y一定也不是6的倍数。
Although 3x is always divisible by 3, image cannot be divisible by 3 since 2 is not divisible by 3. Thus, image cannot be divisible by any multiple of 3, including 6.
使用了代入法，不过此类题目真正的解法是什么？If x is an integer and y = 4x + 3 which of the following CANNOT be a divisor of y ?是一类吗？
考点是什么？
数论（2不能被3整除>> 3x+2不能被 3整除）
谢谢！
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