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单选题
For all positive integers a and b, let (a|b)=(a-b)/(a+b) If m is a positive integer, what is (m|2m) ?
A
-1/2
B
-1/3
C
1/3
D
1/2
E
2
参考答案
参考解析
解析:
(m|2m)=(m-2m)/(m+2m)=-1/3。
(m|2m)=(m-2m)/(m+2m)=-1/3。
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