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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?
A、$$\frac{a}{ 2}$$
B、$$\frac{b}{ 2}$$
C、$$\frac{a+b}{ 2}$$
D、$$\frac{a+2 }{ 2}$$
E、$$\frac{b+2 }{ 2}$$
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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