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-1/2B-1/3C1/3D1/2E2

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


参考解析

解析:
(m|2m)=(m-2m)/(m+2m)=-1/3。

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