If （a-b）and $$\frac{a}{b}$$ are both even numbers; and a and

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If （a-b）and $$\frac{a}{b}$$ are both even numbers; and a and b are both positive integers, then which of the following must be odd?

答案：D

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老师请问这题怎么做呀？

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麻烦问一下老师，要满足两个式子成立a，b是不是都为偶数，那为什么不选择答案c呀

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